int32_t Time = 0;

void setup()
{
  pinMode(11, INPUT_PULLUP);
  Serial.begin(9600);
  Time = millis();
}

void loop()
{
  if (digitalRead(11) == 0)
  {
    Time = millis();
    while (digitalRead(11) == 0)
    {

      delay(10);
    }
     Serial.println( millis() - Time);  
  }
}