help with coin op Project

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so I think that will be to complex for me at this stage

Why?

What I do when I'm faced with a complex program that I don't know enough to write is to break it down into smaller pieces, by calling non-existent functions with non-existent variables.

void loop()
{
   // Get current "time"
   unsigned long now = millis();

   // Is it time to decrement the time remaining?
   if(now - lastDecrement > oneSecond)
   {
      lastDecrement = now;
      timeRemaining--;
   }

   // Did a coin get dumped in?
   if(gotCoin())
      timeRemaining += 1000UL * 10 * 60; // Add 10 minutes

   if(timeRemaining == 0 && deviceIsOn)
      turnDeviceOff();

   if(timeRemaining > 0 && !deviceIsOn)
      turnDeviceOn();
}

So, you can see that you need to declare some variables, with appropriate values - lastDecrement, oneSecond, deviceIsOn - and that you need to develop some functions - gotCoin(), turnDeviceOn(), and turnDeviceOff().

None of those functions seem particularly difficult to develop.

If you need help, take a stab at it, and post your attempt. We promise not to laugh. Too hard.