diff --git a/test/tap/dateFileAppender-test.js b/test/tap/dateFileAppender-test.js
index 3f6ca213..a14f1abf 100644
--- a/test/tap/dateFileAppender-test.js
+++ b/test/tap/dateFileAppender-test.js
@@ -8,6 +8,8 @@ const format = require('date-format');
 const sandbox = require('@log4js-node/sandboxed-module');
 const log4js = require('../../lib/log4js');
 
+const osDelay = process.platform === 'win32' ? 400 : 200;
+
 function removeFile(filename) {
   try {
     fs.unlinkSync(path.join(__dirname, filename));
@@ -40,7 +42,7 @@ test('../../lib/appenders/dateFile', (batch) => {
         );
         t.end();
       });
-    }, 100);
+    }, osDelay);
   });
 
   batch.test('configure with dateFileAppender', (t) => {
diff --git a/test/tap/file-descriptor-leak-test.js b/test/tap/file-descriptor-leak-test.js
index 2a1b9373..8e97aeaa 100644
--- a/test/tap/file-descriptor-leak-test.js
+++ b/test/tap/file-descriptor-leak-test.js
@@ -3,6 +3,8 @@ const fs = require('fs');
 const path = require('path');
 const log4js = require('../../lib/log4js');
 
+const osDelay = process.platform === 'win32' ? 400 : 200;
+
 const removeFiles = async (filenames) => {
   if (!Array.isArray(filenames)) filenames = [filenames];
   const promises = filenames.map((filename) => fs.promises.unlink(filename));
@@ -46,7 +48,7 @@ if (process.platform !== 'win32') {
             `file descriptor count should increase by ${numOfAppenders} after 1st configure() call`
           );
           t.end();
-        }, 250);
+        }, osDelay);
       }
     );
 
@@ -65,7 +67,7 @@ if (process.platform !== 'win32') {
             `file descriptor count should be identical after repeated configure() calls`
           );
           t.end();
-        }, 250);
+        }, osDelay);
       }
     );
 
@@ -82,7 +84,7 @@ if (process.platform !== 'win32') {
             `file descriptor count should be back to initial`
           );
           t.end();
-        }, 250);
+        }, osDelay);
       }
     );
 
diff --git a/test/tap/file-sighup-test.js b/test/tap/file-sighup-test.js
index aa1d2627..8f6a5f5b 100644
--- a/test/tap/file-sighup-test.js
+++ b/test/tap/file-sighup-test.js
@@ -3,6 +3,8 @@ const path = require('path');
 const fs = require('fs');
 const sandbox = require('@log4js-node/sandboxed-module');
 
+const osDelay = process.platform === 'win32' ? 400 : 200;
+
 const removeFiles = async (filenames) => {
   if (!Array.isArray(filenames)) filenames = [filenames];
   const promises = filenames.map((filename) => fs.promises.unlink(filename));
@@ -129,7 +131,7 @@ test('file appender SIGHUP', (t) => {
     t.equal(openCalled, 2, 'open should be called twice');
     t.equal(closeCalled, 1, 'close should be called once');
     t.end();
-  }, 100);
+  }, osDelay);
 });
 
 test('file appender SIGHUP handler leak', (t) => {
diff --git a/test/tap/fileAppender-test.js b/test/tap/fileAppender-test.js
index b9d03ec9..10626f4b 100644
--- a/test/tap/fileAppender-test.js
+++ b/test/tap/fileAppender-test.js
@@ -7,6 +7,8 @@ const sandbox = require('@log4js-node/sandboxed-module');
 const zlib = require('zlib');
 const util = require('util');
 
+const osDelay = process.platform === 'win32' ? 400 : 200;
+
 const sleep = util.promisify(setTimeout);
 const gunzip = util.promisify(zlib.gunzip);
 const EOL = require('os').EOL || '\n';
@@ -40,7 +42,7 @@ test('log4js fileAppender', (batch) => {
 
     logger.info('This should be in the file.');
 
-    await sleep(250);
+    await sleep(osDelay);
     const fileContents = await fs.readFile(testFile, 'utf8');
     t.match(fileContents, `This should be in the file.${EOL}`);
     t.match(
@@ -151,7 +153,7 @@ test('log4js fileAppender', (batch) => {
     logger.info('This is an intermediate log message.');
     logger.info('This is the second log message.');
     // wait for the file system to catch up
-    await sleep(250);
+    await sleep(osDelay * 2);
     const fileContents = await fs.readFile(testFile, 'utf8');
     t.match(fileContents, 'This is the second log message.');
     t.equal(fileContents.indexOf('This is the first log message.'), -1);
@@ -219,7 +221,7 @@ test('log4js fileAppender', (batch) => {
     logger.info('This is the second log message.');
 
     // wait for the file system to catch up
-    await sleep(250);
+    await sleep(osDelay);
     const fileContents = await fs.readFile(testFile, 'utf8');
     t.match(fileContents, 'This is the second log message.');
     t.notMatch(fileContents, 'These are the log messages for the first file.');
@@ -272,7 +274,7 @@ test('log4js fileAppender', (batch) => {
     logger.info('This is the third log message.');
     logger.info('This is the fourth log message.');
     // give the system a chance to open the stream
-    await sleep(250);
+    await sleep(osDelay);
     const files = await fs.readdir(__dirname);
     const logFiles = files
       .sort()
@@ -334,7 +336,7 @@ test('log4js fileAppender', (batch) => {
     logger.info('This is the third log message.');
     logger.info('This is the fourth log message.');
     // give the system a chance to open the stream
-    await sleep(250);
+    await sleep(osDelay);
     const files = await fs.readdir(__dirname);
     const logFiles = files
       .sort()
@@ -503,7 +505,7 @@ test('log4js fileAppender', (batch) => {
       []
     );
 
-    await sleep(250);
+    await sleep(osDelay);
     let fileContents = await fs.readFile(testFilePlain, 'utf8');
     t.match(
       fileContents,
diff --git a/test/tap/logLevelFilter-test.js b/test/tap/logLevelFilter-test.js
index aebf8b4a..0b19519e 100644
--- a/test/tap/logLevelFilter-test.js
+++ b/test/tap/logLevelFilter-test.js
@@ -4,6 +4,8 @@ const os = require('os');
 
 const EOL = os.EOL || '\n';
 
+const osDelay = process.platform === 'win32' ? 400 : 200;
+
 function remove(filename) {
   try {
     fs.unlinkSync(filename);
@@ -155,7 +157,7 @@ test('log4js logLevelFilter', (batch) => {
         }
       );
       t.end();
-    }, 500);
+    }, osDelay);
   });
 
   batch.end();
diff --git a/test/tap/multi-file-appender-test.js b/test/tap/multi-file-appender-test.js
index 42f5959c..34fa2922 100644
--- a/test/tap/multi-file-appender-test.js
+++ b/test/tap/multi-file-appender-test.js
@@ -226,7 +226,7 @@ test('multiFile appender', (batch) => {
       debug.enable(originalNamespace);
     });
 
-    const timeoutMs = 100;
+    const timeoutMs = 200;
     log4js.configure({
       appenders: {
         multi: {