Are you saying:
1. Agent chooses lunch.
2. Finesse set Not Ready Lunch.
3. Finesse then automatically sets them back to ready after X minutes as their lunch break is over.
Unfortunately, no that's not possible. You could create a CUIC report which turns red when an agent has been set in a particular state for X minutes, but nothing will be automatic. Another approach would be some custom gadget in Finesse to handle this for you.
david