diff --git a/action.yml b/action.yml
index 0339dd4..76226bb 100644
--- a/action.yml
+++ b/action.yml
@@ -37,6 +37,9 @@ inputs:
   custom_api_endpoint:
     description: 'Custom API endpoint of LanguageTool server. e.g. https://languagetool.org/api'
     default: ''
+  wait_server_startup_duration:
+    description: 'Wait the startup of the server.'
+    default: '3'
 runs:
   using: 'docker'
   image: 'Dockerfile'
diff --git a/entrypoint.sh b/entrypoint.sh
index 3e2fd6d..e7c9442 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -5,7 +5,8 @@ API_ENDPOINT="${INPUT_CUSTOM_API_ENDPOINT}"
 if [ -z "${INPUT_CUSTOM_API_ENDPOINT}" ]; then
   API_ENDPOINT=http://localhost:8010
   java -cp "/LanguageTool/languagetool-server.jar" org.languagetool.server.HTTPServer --port 8010 &
-  sleep 3 # Wait the server statup.
+  echo "Wait the server startup for ${INPUT_WAIT_SERVER_STARTUP_DURATION}s"
+  sleep "${INPUT_WAIT_SERVER_STARTUP_DURATION}" # Wait the server startup.
 fi
 
 echo "API ENDPOINT: ${API_ENDPOINT}" >&2