int push = 4;
int pot = A0;
int led = 7;

void setup() {
  pinMode(push, INPUT_PULLUP);
  pinMode(led, OUTPUT);
  pinMode(pot, INPUT);
  digitalWrite(led, LOW);
}

void loop() {
  if(digitalRead(push) == LOW){
    int temps = analogRead(pot)*10;
    digitalWrite(led, HIGH);
    delay(temps);
    digitalWrite(led, LOW);
  }
}