Bonus Time

Bonus time gives you 10x increase in production.

(Although sometimes it is reported to have issues)

Obtaining bonus time
You can obtain bonus time through 2 ways. You can buy the Bonus Time pack in the shop for 25 Robux to get 50 bonus seconds. You can also get it by waiting out of the game.(I just did an experiment and it seems you get 1 bonus time every 5 minutes you are out of the game)

There is a max of 360 bonus time (I stopped playing the game for like 1 year and only 360 bonus time so yea)

There does not appear to be a limit so far. Proof: 1859 bonus time and counting.