Let's cut right to the chase. It's bi-weekly. Every other week, twice a month, however you say it.
Are there exceptions? Of course!
Are your episodes long and a ton of effort to get out the door? Monthly might be the right schedule for you. You could even publish less frequently if your episodes correspond to world events that happen more infrequently, like sports championships or national comic conventions.
Do you have so much to say and just once every other week is not enough time to say it? Maybe a weekly schedule is more your style. A word of caution, however: make sure you have the time and bandwidth to commit to that schedule. It's better to go from bi-weekly to weekly than to have to scale back and leave your audience expecting more than you can offer.
Do you want to publish more than once a week? Ideally, you will need a team of people working to get your podcast out on specific days. Bristol Pod Works can be the team you need!
But yeah, start with bi-weekly and see how things go from there.