No deadlines here! Do not worry....
The month, day and time you publish are up to you!
Recently does run on a monthly or quarterly cycle. Each cycle a magazine credit is dropped onto your account so you can publish one free magazine. You can always make more magazines than the one included in the subscription. The app will charge accordingly on checkout.
We do know that sometimes life gets hectic and you can't get to publish during the cycle. If that's the case, don't worry. The app will retain a magazine credit for 12 months so you have ample time to publish that magazine.