Riding the Time Quest Rollercoaster

A few days ago, it gave 300 gems. I did it for a hidden quest, and after completing it, I thought I was done. Yesterday it gave 3800 gems, and just now, 5000 gems lol. Also, if anyone is doing the hidden quest 'Complete the 2nd Restaurant,' you should expect it to take quite a bit of time. You need to collect all the keys to complete the restaurant mission, and it's not as easy as you might think.