You can withdrawal money which has cleared into your Tip Jar at anytime, and there is no limit on the amount or frequency.
The only consideration is the time it takes for new tips to clear into your Tip Jar via the Bank ACH process. An ACH transfer from your checking account typically takes 1-2 business days and additional days due to Bank Holidays. New tips which are still processing are not eligible for withdrawal.
You can get details on your pending tip transfers from the App Menu by selecting "Pending Tip Transfers"