sclass NotTooOften {
  long minDelay;
  long lastTime;
  
  *() {}
  *(long *minDelay) {}
  *(double minSeconds) { minDelay = toMS(minSeconds); }
  
  bool canDoAgain_willDoIfTrue aka yo aka get() {
    ping();
    if (lastTime == 0 || now() >= lastTime+minDelay)
      ret true with lastTime = now();
    false;
  }
  
  void dO(Runnable r) {
    if (get()) r?.run();
  }
}