diff --git a/test/thread/thread.condition/thread.condition.condvarany/wait_until.pass.cpp b/test/thread/thread.condition/thread.condition.condvarany/wait_until.pass.cpp
index 7b21660c1..15bf80953 100644
--- a/test/thread/thread.condition/thread.condition.condvarany/wait_until.pass.cpp
+++ b/test/thread/thread.condition/thread.condition.condvarany/wait_until.pass.cpp
@@ -68,7 +68,7 @@ void f()
     }
     else
     {
-        assert(t1 - t0 - Clock::duration(250) < Clock::duration(5));
+        assert(t1 - t0 - Clock::duration(250) < Clock::duration(50));
         assert(test2 == 0);
     }
     ++runs;
diff --git a/test/thread/thread.mutex/thread.lock/thread.lock.guard/adopt_lock.pass.cpp b/test/thread/thread.mutex/thread.lock/thread.lock.guard/adopt_lock.pass.cpp
index 57341e878..6f6888478 100644
--- a/test/thread/thread.mutex/thread.lock/thread.lock.guard/adopt_lock.pass.cpp
+++ b/test/thread/thread.mutex/thread.lock/thread.lock.guard/adopt_lock.pass.cpp
@@ -36,7 +36,7 @@ void f()
     t1 = Clock::now();
     }
     ns d = t1 - t0 - ms(250);
-    assert(d < ns(2500000));  // within 2.5ms
+    assert(d < ms(50));  // within 50ms
 }
 
 int main()
diff --git a/test/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.pass.cpp b/test/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.pass.cpp
index a0bcd387a..d47222d19 100644
--- a/test/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.pass.cpp
+++ b/test/thread/thread.mutex/thread.lock/thread.lock.guard/mutex.pass.cpp
@@ -35,7 +35,7 @@ void f()
     t1 = Clock::now();
     }
     ns d = t1 - t0 - ms(250);
-    assert(d < ns(2500000));  // within 2.5ms
+    assert(d < ms(200));  // within 200ms
 }
 
 int main()
diff --git a/test/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex.pass.cpp b/test/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex.pass.cpp
index 6c12e1fa7..4b08aca16 100644
--- a/test/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex.pass.cpp
+++ b/test/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex.pass.cpp
@@ -35,7 +35,7 @@ void f()
     t1 = Clock::now();
     }
     ns d = t1 - t0 - ms(250);
-    assert(d < ns(2500000));  // within 2.5ms
+    assert(d < ms(50));  // within 50ms
 }
 
 int main()
diff --git a/test/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_time_point.pass.cpp b/test/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_time_point.pass.cpp
index 21ee88d79..8faf88fd4 100644
--- a/test/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_time_point.pass.cpp
+++ b/test/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_time_point.pass.cpp
@@ -44,7 +44,7 @@ void f2()
     assert(lk.owns_lock() == false);
     time_point t1 = Clock::now();
     ns d = t1 - t0 - ms(250);
-    assert(d < ns(5000000));  // within 5ms
+    assert(d < ms(50));  // within 50ms
 }
 
 int main()
diff --git a/test/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/lock.pass.cpp b/test/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/lock.pass.cpp
index 222ebcb08..8fde81813 100644
--- a/test/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/lock.pass.cpp
+++ b/test/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/lock.pass.cpp
@@ -35,7 +35,7 @@ void f()
     time_point t1 = Clock::now();
     m.unlock();
     ns d = t1 - t0 - ms(250);
-    assert(d < ns(2500000));  // within 2.5ms
+    assert(d < ms(50));  // within 50ms
 }
 
 int main()
diff --git a/test/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/try_lock.pass.cpp b/test/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/try_lock.pass.cpp
index 0d248c29d..6ef01602d 100644
--- a/test/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/try_lock.pass.cpp
+++ b/test/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.class/try_lock.pass.cpp
@@ -37,7 +37,7 @@ void f()
     time_point t1 = Clock::now();
     m.unlock();
     ns d = t1 - t0 - ms(250);
-    assert(d < ns(50000000));  // within 50ms
+    assert(d < ms(200));  // within 200ms
 }
 
 int main()
diff --git a/test/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/try_lock.pass.cpp b/test/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/try_lock.pass.cpp
index 2f82d4fdb..f63e0ef99 100644
--- a/test/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/try_lock.pass.cpp
+++ b/test/thread/thread.mutex/thread.mutex.requirements/thread.mutex.requirements.mutex/thread.mutex.recursive/try_lock.pass.cpp
@@ -39,7 +39,7 @@ void f()
     m.unlock();
     m.unlock();
     ns d = t1 - t0 - ms(250);
-    assert(d < ns(50000000));  // within 50ms
+    assert(d < ms(200));  // within 200ms
 }
 
 int main()
diff --git a/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock.pass.cpp b/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock.pass.cpp
index 41ddbbcf5..d5a06bfcb 100644
--- a/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock.pass.cpp
+++ b/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock.pass.cpp
@@ -37,7 +37,7 @@ void f()
     time_point t1 = Clock::now();
     m.unlock();
     ns d = t1 - t0 - ms(250);
-    assert(d < ns(50000000));  // within 50ms
+    assert(d < ms(200));  // within 200ms
 }
 
 int main()
diff --git a/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock_for.pass.cpp b/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock_for.pass.cpp
index 1253659e2..5e4d5f13a 100644
--- a/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock_for.pass.cpp
+++ b/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock_for.pass.cpp
@@ -34,7 +34,7 @@ void f1()
     time_point t1 = Clock::now();
     m.unlock();
     ns d = t1 - t0 - ms(250);
-    assert(d < ns(5000000));  // within 5ms
+    assert(d < ms(50));  // within 50ms
 }
 
 void f2()
@@ -43,7 +43,7 @@ void f2()
     assert(m.try_lock_for(ms(250)) == false);
     time_point t1 = Clock::now();
     ns d = t1 - t0 - ms(250);
-    assert(d < ns(5000000));  // within 5ms
+    assert(d < ms(50));  // within 50ms
 }
 
 int main()
diff --git a/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock.pass.cpp b/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock.pass.cpp
index fe5ef80a4..d56e8bc2f 100644
--- a/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock.pass.cpp
+++ b/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock.pass.cpp
@@ -39,7 +39,7 @@ void f()
     m.unlock();
     m.unlock();
     ns d = t1 - t0 - ms(250);
-    assert(d < ns(50000000));  // within 50ms
+    assert(d < ms(200));  // within 200ms
 }
 
 int main()