bool StatusOfLED = false;
byte StatusOfButton = 0;
long TimeOfStateNumber=0, CurrentTime = 10;
void setup()
{

    pinMode(4, OUTPUT);

    pinMode(8, INPUT_PULLUP);
}

void loop()
{

    switch (StatusOfButton)
    {
        case 0:

            if (digitalRead(8) == true)
            {
                StatusOfButton = 1;
                TimeOfStateNumber = millis();
            }
            break;

        case 1:

            if (digitalRead(8))
                StatusOfButton = 0;

            else if (millis() - TimeOfStateNumber > CurrentTime)
            {
                StatusOfLED = !StatusOfLED;
                StatusOfButton = 2;
            }
            break;

        case 2:

            if (digitalRead(8))
                StatusOfButton = 0;
            break;

        default:
            break;
    }

    digitalWrite(4, StatusOfLED);
}