diff --git a/tests/test_effect.py b/tests/test_effect.py
index 362f413..ca69a20 100644
--- a/tests/test_effect.py
+++ b/tests/test_effect.py
@@ -184,6 +184,7 @@ def test_memoize(self):
         assert double_e.run(None) == 'result'
         assert state.value == ('modify was called', )
 
+    @settings(deadline=None)
     @given(effects(), effects())
     def test_and_then_cpu_bound(self, e1, e2):
         e1.and_then(effect.cpu_bound(lambda _: e2)).run(None) == e2.run(None)
@@ -203,6 +204,7 @@ def test_recover_io_bound(self, e):
         effect.error('').recover(effect.io_bound(lambda _: e)
                                  ).run(None) == e.run(None)
 
+    @settings(deadline=None)
     @given(effects(), anything())
     def test_map_cpu_bound(self, e, value):
         e.map(effect.cpu_bound(lambda _: value)).run(None) == value
@@ -222,6 +224,7 @@ def test_combine_io_bound(self, e1, e2):
         effect.combine(e1, e2)(effect.io_bound(lambda v1, v2: (v1, v2))
                                ).run(None) == (e1.run(None), e2.run(None))
 
+    @settings(deadline=None)
     @given(effects(), effects())
     def test_lift_cpu_bound(self, e1, e2):
         effect.lift(effect.cpu_bound(lambda v1, v2: (v1, v2))
@@ -232,6 +235,7 @@ def test_lift_io_bound(self, e1, e2):
         effect.lift(effect.io_bound(lambda v1, v2: (v1, v2))
                     )(e1, e2).run(None) == (e1.run(None), e2.run(None))
 
+    @settings(deadline=None)
     @given(unaries(rights()))
     def test_from_callable_cpu_bound(self, f):
         assert effect.from_callable(effect.cpu_bound(f)