Hotspot User Speed Falldown

Is it possible to make the rates drop if the user has reached it’s max download?

Example:

From:
Max download: 2gb
Rates Rx/Tx: 1mbps/1mbps

To:
Max download: Unlimited
Rates Rx/Tx: 256kbps/256kbps

Then after midnight, it’ll go back from 256kbps to 1mbps.

Any feedback is appreciated.