Software Timers period value question?

Firmware
9

If each of your periodes is 15min then why not have one multi-shot timer that just stops after 8 events?

void timerCallback() {
  static int count = 0;
  // do whatever
  if (++count >= 8) {
    t.stop();
    count = 0; // for next 8-part run
  }
}