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Nahhhh. I was actually thinking an hour at first. 30 minutes flies by in a conversation.

Probably best not to set a time really, as you're right. Depending on how interesting the person is, and the conversation, it could end up being a few hours. Lol.

I like the interview idea but I agree 30 minutes is a bit long. Yeah, a half hour conversation flies by when you're an active part of said conversation, but if you're just listening in, it could be a little tedious. I think a "speed dating" method of interview might work best, just giving 5-10 minutes to introduce oneself.

if you consider the fact it's a weekly post sure. Maybe multiple introductions. Still, it would be a bit rushed.