const int buttonPin = 2;
const int ledPin = 13;
int x =0;

unsigned long buttonPressStart = 0;
bool ledState = false;

void setup() {
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);
}

void loop() {
  if (digitalRead(buttonPin) == LOW) {
    if (buttonPressStart == 0) {
      buttonPressStart = millis();
    }
    else if (millis() - buttonPressStart >= 2000) {
      while( digitalRead(buttonPin) == HIGH)
      {
      digitalWrite(ledPin, !digitalRead(ledPin));
      delay(500);
      }
    }
  }
  else {
    if (buttonPressStart != 0 && millis() - buttonPressStart < 2000) {
      ledState = !ledState;
      digitalWrite(ledPin, ledState);
    }
    buttonPressStart = 0;
  }
}