Monitor the analog signal without loop

Using Arduino Project Guidance
4

something like this?

unsigned long start = 0;

void setup()
{
  pinMode(13, OUTPUT);
  Serial.begin(115200);
  Serial.println("start");
}

void loop()
{
  if (start == 0)    // will be true only once ...
  {
    digitalWrite(13, HIGH);
    start = millis();
  }

  x = analogRead(A0);
  Serial.println(x, DEC);   // do something with x

  delay(1000);   // to be tuned

  if (millis() - start > 60000L)   // are there 60 seconds past after start has been set?
  {
    digitalWrite(13, LOW);
    for(;;);
  }
}

Dont compile this code, just read it oud loud and understand what it does.