If you ask me........and you have.

You should NEVER stop shooting your bow. Shoot year round even if its just a few arrows a week in the deep offseason. Shooting a bow is NOTHING like shooting a rifle. Good shooting depends upon repeatable form, muscle tone and famiarity with your equipment above and beyond any gun hunting, that only comes with many hours behind the string.
We as archers also need to learn range estimation, shooting from heights, tuning proper gear selection and so on and so on.......
The above average archer can and will be able to pull it together with minimal prep time before a hunt......sort of like riding a bike, but the true ARCHERS wouldn' t dream of picking the bow up a week before the season starts.
The average archer to beginner should begin WELL in advance of the season since they by definition need the most work.

And almost as important as preseason shooting practice is IN SEASON shooting practice. Too many guys forget to keep sharp after opening day........shoot a few arrows before or after each hunt and on off days and you won' t lose that edge.