But I'd go less than 35 days..basically 10-25 days, enough time that you can take a break from RHP, but not interrupt the flow of tournaments and such..
I'd make the system so that vacation days must be taken in chunks. For example you could get 7 4-day vacation chunks.
There would be a minimum amount of notice time you would have to give (say 1 chunk), and a minimum amount of time in between vacation days, so that you couldn't come off for vacation for 1 day and then go back on vacation.
I'd also make it 'respect vacation bank' a yes/no option when starting a new game challenge, so that people who insist on not having one do not.