Ideal podcast length is 90m-120m imo (one way, long commute) and release cadence should be 3 weekly. 3 per week ensures I'll probably want to listen to one of them on a weekly basis, but isn't so many to choose from that I'm overwhelmed by choice. If you can get me to listen to one per week, you'll have caught me in a habit.

This is probably hard to do with my wished podcast, but it's still worth thinking about.