A podcast can be virtually any length. Editing will help trim the fat, remove stumbles and restarts, but you should try and fit the show around the content, not edit to fit a time slot.
It might take a few tries before you find your show’s natural length. From then on, having a sense of it can help you stay consistent.
Your fans will fold the show into their weekly schedules, and they’ll come to expect the same rough length of show each time.
How often you post also matters a lot, and will massively affect your workflow. When deciding whether to go weekly, fortnightly, monthly or at your own pace, you need to be super-certain you can stick to the plan, because the more your schedule slips, the easier it is for the podcast to fall down the priority list.
Keeping to a manageable schedule means for a more enjoyable recording, a less stressful edit and a sustainable show.
Commute-length shows do well
It should be consistent
If it’s long, consider using chapters to break it up
If listeners like the show, they’ll expect it at the same time each week, fortnight or month
Avoid posting less frequently than every two weeks, as apps like Apple Podcasts demote infrequent shows and check the feeds less often
Pick a schedule that’s sustainable for you and your co-hosts
If you’re working with others, be completely certain they can stick to the schedule too
Look at your calendar. If you’re bringing in co-hosts, see if you can look at theirs too
Find a regular time slot in your week to record each episode. Add a half-hour buffer before and after the slot, to allow for setup and wind-down
Find a regular time slot in your week to edit each episode. Depending on how close you want to perform your edit, it could take 15 minutes to a 2-3 hours. Add time for downloading remotely-recorded audio and for the upload process, including writing show notes