Board Thread:Game Discussion/@comment-193.149.117.115-20170705103255/@comment-26829117-20170705122237

The number of ads you get refreshes each day at midnight. First 5GC then some R$ and more GC if you keep watching. However, there is a limit to the number of Ads you can watch in a 24 hour period so if you are watching ads to speed up servicing or upgrades then you might not have enough ad tokens to get the GC ones immediately. This is why you have to wait for them to appear.

The answer to this is to reset your Ad ID as RR3G'hamO. said above