unsigned long currentTime = 0, previousTime = 0, previousTime2 = 0;
int interval = 1000;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  currentTime = millis();
  myDelay(previousTime, 1000, "Hello");
  myDelay(previousTime2, 2000, "Hola");
}

void myDelay(unsigned long &pvT, int intv, String text) {
  if(currentTime - pvT >= intv) {
    Serial.println(text);
    pvT = currentTime;
  }
}