diff --git a/src/test/java/io/reactivex/XFlatMapTest.java b/src/test/java/io/reactivex/XFlatMapTest.java
index 6604700c00..028814e5ec 100644
--- a/src/test/java/io/reactivex/XFlatMapTest.java
+++ b/src/test/java/io/reactivex/XFlatMapTest.java
@@ -23,7 +23,7 @@
 
 import io.reactivex.exceptions.TestException;
 import io.reactivex.functions.Function;
-import io.reactivex.observers.TestObserver;
+import io.reactivex.observers.*;
 import io.reactivex.plugins.RxJavaPlugins;
 import io.reactivex.schedulers.Schedulers;
 import io.reactivex.subscribers.TestSubscriber;
@@ -31,7 +31,7 @@
 public class XFlatMapTest {
 
     @Rule
-    public Retry retry = new Retry(3, 1000, true);
+    public Retry retry = new Retry(5, 1000, true);
 
     static final int SLEEP_AFTER_CANCEL = 500;
 
@@ -40,12 +40,23 @@ public class XFlatMapTest {
     void sleep() throws Exception {
         cb.await();
         try {
+            long before = System.currentTimeMillis();
             Thread.sleep(5000);
+            throw new IllegalStateException("Was not interrupted in time?! " + (System.currentTimeMillis() - before));
         } catch (InterruptedException ex) {
             // ignored here
         }
     }
 
+    void beforeCancelSleep(BaseTestConsumer<?, ?> ts) throws Exception {
+        long before = System.currentTimeMillis();
+        Thread.sleep(50);
+        if (System.currentTimeMillis() - before > 100) {
+            ts.dispose();
+            throw new IllegalStateException("Overslept?" + (System.currentTimeMillis() - before));
+        }
+    }
+
     @Test
     public void flowableFlowable() throws Exception {
         List<Throwable> errors = TestHelper.trackPluginErrors();
@@ -63,7 +74,7 @@ public Publisher<Integer> apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
@@ -94,7 +105,7 @@ public Single<Integer> apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
@@ -125,7 +136,7 @@ public Maybe<Integer> apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
@@ -156,7 +167,7 @@ public Completable apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
@@ -188,7 +199,7 @@ public Completable apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
@@ -219,7 +230,7 @@ public Observable<Integer> apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
@@ -250,7 +261,7 @@ public Single<Integer> apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
@@ -281,7 +292,7 @@ public Maybe<Integer> apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
@@ -312,7 +323,7 @@ public Completable apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
@@ -344,7 +355,7 @@ public Completable apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
@@ -375,7 +386,7 @@ public Single<Integer> apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
@@ -406,7 +417,7 @@ public Maybe<Integer> apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
@@ -437,7 +448,7 @@ public Completable apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
@@ -469,7 +480,7 @@ public Completable apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
@@ -500,7 +511,7 @@ public Single<Integer> apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
@@ -531,7 +542,7 @@ public Maybe<Integer> apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
@@ -562,7 +573,7 @@ public Completable apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
@@ -594,7 +605,7 @@ public Completable apply(Integer v) throws Exception {
 
             cb.await();
 
-            Thread.sleep(50);
+            beforeCancelSleep(ts);
 
             ts.cancel();
 
diff --git a/src/test/java/io/reactivex/internal/operators/observable/ObservableMergeMaxConcurrentTest.java b/src/test/java/io/reactivex/internal/operators/observable/ObservableMergeMaxConcurrentTest.java
index 057f51dff2..202fe7fdc8 100644
--- a/src/test/java/io/reactivex/internal/operators/observable/ObservableMergeMaxConcurrentTest.java
+++ b/src/test/java/io/reactivex/internal/operators/observable/ObservableMergeMaxConcurrentTest.java
@@ -201,7 +201,7 @@ public void testSimpleAsyncLoop() {
             }
         }
     }
-    @Test(timeout = 10000)
+    @Test(timeout = 30000)
     public void testSimpleAsync() {
         for (int i = 1; i < 50; i++) {
             TestObserver<Integer> ts = new TestObserver<Integer>();
@@ -221,13 +221,13 @@ public void testSimpleAsync() {
             assertEquals(expected, actual);
         }
     }
-    @Test(timeout = 10000)
+    @Test(timeout = 30000)
     public void testSimpleOneLessAsyncLoop() {
         for (int i = 0; i < 200; i++) {
             testSimpleOneLessAsync();
         }
     }
-    @Test(timeout = 10000)
+    @Test(timeout = 30000)
     public void testSimpleOneLessAsync() {
         long t = System.currentTimeMillis();
         for (int i = 2; i < 50; i++) {