diff --git a/controller_verify/README.md b/controller_verify/README.md
index f4a94b7..f46e9b4 100644
--- a/controller_verify/README.md
+++ b/controller_verify/README.md
@@ -26,7 +26,7 @@
 #define SERIAL_SPEED    9600  // 시리얼 통신 속도
 
 #define INPUT_CHAR_ON_VERIFY_KEYBOARD 'a'  // 키보드 입력 검증 시 누를 키
-#define PRESSING_TICK_ON_VERIFY_KEYBOARD 500  // 키보드 입력 검증 시 키 누르는 시간
+#define PRESSING_MILLISECONDS_ON_VERIFY_KEYBOARD 3000  // 키보드 입력 검증 시 키 누르는 시간
 #define COMMAND_INVOKE_VERIFY_KEYBOARD 'k'  // 키보드 입력 검증 명령어
 #define COMMAND_INVOKE_VERIFY_EEPROM 'e'  // 저장 검증 명령어
 ```
diff --git a/controller_verify/controller_verify.ino b/controller_verify/controller_verify.ino
index 07dfe0a..c4ee9f9 100644
--- a/controller_verify/controller_verify.ino
+++ b/controller_verify/controller_verify.ino
@@ -19,7 +19,7 @@
 #define VERIFY_KEYBOARD true
 
 #define INPUT_CHAR_ON_VERIFY_KEYBOARD 'a'
-#define PRESSING_TICK_ON_VERIFY_KEYBOARD 500
+#define PRESSING_MILLISECONDS_ON_VERIFY_KEYBOARD 3000
 #define COMMAND_INVOKE_VERIFY_KEYBOARD 'k'
 #define COMMAND_INVOKE_VERIFY_EEPROM 'e'
 
@@ -30,7 +30,8 @@
 #include <Keyboard.h>
 #endif
 
-int pressingTick = 0;
+bool pressingInvoked = false;
+unsigned long pressingInvokedAt = -1;
 
 void setup() {
   #if VERIFY_KEYBOARD
@@ -53,8 +54,16 @@ void setup() {
 
 void loop() {
   #if VERIFY_KEYBOARD
-  if (pressingTick--) {
-    Keyboard.release(INPUT_CHAR_ON_VERIFY_KEYBOARD);
+  if (pressingInvoked) {
+    unsigned long now = millis();
+    if (millis() - pressingInvokedAt > PRESSING_MILLISECONDS_ON_VERIFY_KEYBOARD) {
+      Keyboard.release(INPUT_CHAR_ON_VERIFY_KEYBOARD);
+      Serial.print("[Keyboard] Pressing done. (Released at: ");
+      Serial.print(now);
+      Serial.println(")");
+      pressingInvoked = false;
+    } else {
+    }
   }
   #endif
   
@@ -78,17 +87,20 @@ void loop() {
 
 void invokeVerifyKeyboard() {
   #if VERIFY_KEYBOARD
+  pressingInvoked = true;
   Keyboard.write(INPUT_CHAR_ON_VERIFY_KEYBOARD);
   Serial.print("[Keyboard] `");
   Serial.print(INPUT_CHAR_ON_VERIFY_KEYBOARD);
   Serial.println("` has been wrote.");
 
-  pressingTick = PRESSING_TICK_ON_VERIFY_KEYBOARD;
+  pressingInvokedAt = millis();
   Serial.print("[Keyboard] `");
   Serial.print(INPUT_CHAR_ON_VERIFY_KEYBOARD);
   Serial.print("` will be pressed for ");
-  Serial.print(pressingTick);
-  Serial.println("ticks.");
+  Serial.print(PRESSING_MILLISECONDS_ON_VERIFY_KEYBOARD);
+  Serial.print(" milliseconds. (Started at: ");
+  Serial.print(pressingInvokedAt);
+  Serial.println(")");
   Keyboard.press(INPUT_CHAR_ON_VERIFY_KEYBOARD);
   #else
   Serial.println("[Keyboard] Keyboard verification has been disabled.");