So, basically what I'm suggesting is adding a parameter to the betting start command that would dictate how long betting was open for before it automatically closed itself. That way a mod could start the betting and sort of set and forget it until the time came to select the winner.
e.g. !betting start <timer in seconds> <maxbets> <housecut> <betting_on> <option1> <option2> [ !betting start 60s 100 0 This_is_a_test_bet yes no maybe ]