diff --git a/core-java-modules/core-java-os/src/test/java/com/baeldung/example/soundapi/AppUnitTest.java b/core-java-modules/core-java-os/src/test/java/com/baeldung/example/soundapi/AppUnitTest.java
index 27bc750d8a..849f71dc03 100644
--- a/core-java-modules/core-java-os/src/test/java/com/baeldung/example/soundapi/AppUnitTest.java
+++ b/core-java-modules/core-java-os/src/test/java/com/baeldung/example/soundapi/AppUnitTest.java
@@ -23,7 +23,7 @@ public class AppUnitTest {
         soundRecorder.build(af);
         try {
             soundRecorder.start();
-            Thread.sleep(20000);
+            Thread.sleep(5000);
             soundRecorder.stop();
         } catch (InterruptedException ex) {
             fail("Exception: " + ex);
diff --git a/core-java-modules/core-java-os/src/test/java/com/baeldung/java9/process/ProcessApiUnitTest.java b/core-java-modules/core-java-os/src/test/java/com/baeldung/java9/process/ProcessApiUnitTest.java
index c3f390d8ae..dae1a705ed 100644
--- a/core-java-modules/core-java-os/src/test/java/com/baeldung/java9/process/ProcessApiUnitTest.java
+++ b/core-java-modules/core-java-os/src/test/java/com/baeldung/java9/process/ProcessApiUnitTest.java
@@ -69,7 +69,7 @@ public class ProcessApiUnitTest {
             });
         });
 
-        Thread.sleep(10000);
+        Thread.sleep(5000);
 
         childProc = ProcessHandle.current().children();
         childProc.forEach(procHandle -> {
@@ -100,7 +100,7 @@ public class ProcessApiUnitTest {
     private void waistCPU() throws NoSuchAlgorithmException {
         ArrayList<Integer> randArr = new ArrayList<Integer>(4096);
         SecureRandom sr = SecureRandom.getInstanceStrong();
-        Duration somecpu = Duration.ofMillis(4200L);
+        Duration somecpu = Duration.ofMillis(2000L);
         Instant end = Instant.now().plus(somecpu);
         while (Instant.now().isBefore(end)) {
             // System.out.println(sr.nextInt());