void trackFanUsage() {
  int currentMinute = 0;
  static int totalRunMinutes = 0;

  currentMinute++;
  totalRunMinutes++;

  Serial.print("Current check runtime = ");
  Serial.print(currentMinute);
  Serial.print(" minute, Total fan runtime = ");
  Serial.print(totalRunMinutes);
  Serial.println(" minutes");
}

void setup() {
  Serial.begin(9600);
}

void loop() {
  trackFanUsage();
  delay(1000);
}