diff --git a/test/thread/thread.condition/thread.condition.condvarany/wait_for_pred.pass.cpp b/test/thread/thread.condition/thread.condition.condvarany/wait_for_pred.pass.cpp
index 856297dba..bc4b7c342 100644
--- a/test/thread/thread.condition/thread.condition.condvarany/wait_for_pred.pass.cpp
+++ b/test/thread/thread.condition/thread.condition.condvarany/wait_for_pred.pass.cpp
@@ -61,7 +61,7 @@ void f()
     }
     else
     {
-        assert(t1 - t0 - milliseconds(250) < milliseconds(5));
+        assert(t1 - t0 - milliseconds(250) < milliseconds(50));
         assert(test2 == 0);
     }
     ++runs;
diff --git a/test/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_duration.pass.cpp b/test/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_duration.pass.cpp
index 137c913e2..8370c563f 100644
--- a/test/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_duration.pass.cpp
+++ b/test/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_duration.pass.cpp
@@ -34,7 +34,7 @@ void f1()
     assert(lk.owns_lock() == true);
     time_point t1 = Clock::now();
     ns d = t1 - t0 - ms(250);
-    assert(d < ns(5000000));  // within 5ms
+    assert(d < ms(50));  // within 50ms
 }
 
 void f2()
@@ -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.lock/thread.lock.unique/thread.lock.unique.locking/lock.pass.cpp b/test/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/lock.pass.cpp
index fa50c7b3e..c101d8901 100644
--- a/test/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/lock.pass.cpp
+++ b/test/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.locking/lock.pass.cpp
@@ -34,7 +34,7 @@ void f()
     time_point t1 = Clock::now();
     assert(lk.owns_lock() == true);
     ns d = t1 - t0 - ms(250);
-    assert(d < ns(2500000));  // within 2.5ms
+    assert(d < ms(25));  // within 25ms
     try
     {
         lk.lock();
diff --git a/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock_until.pass.cpp b/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock_until.pass.cpp
index ac70d4a98..f19dec267 100644
--- a/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock_until.pass.cpp
+++ b/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.class/try_lock_until.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_until(Clock::now() + 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_until.pass.cpp b/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock_until.pass.cpp
index bfda9edce..e5e916637 100644
--- a/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock_until.pass.cpp
+++ b/test/thread/thread.mutex/thread.mutex.requirements/thread.timedmutex.requirements/thread.timedmutex.recursive/try_lock_until.pass.cpp
@@ -36,7 +36,7 @@ void f1()
     m.unlock();
     m.unlock();
     ns d = t1 - t0 - ms(250);
-    assert(d < ns(5000000));  // within 5ms
+    assert(d < ms(50));  // within 50ms
 }
 
 void f2()
@@ -45,7 +45,7 @@ void f2()
     assert(m.try_lock_until(Clock::now() + 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()