This may sound like a stupid forum, but I'll just post it out anyway. I submitted 2 runs for a couple games, but their communities aren't as active as others. How long will it take for them to be accepted? I'm not too concerned about them, but I'm worried they won't be accepted at all.

It depends if the moderators are active. If they are, your run will probably (eventually) be accepted. If they aren't active at all (e.g. last online: 4 weeks ago), you can make a request to be mod of that game. It should be able to request moderation in the support hub.

less activity doesnt necessarily mean that youll have to wait longer than normal for your runs to be verified. id say youd have to wait less time though it of course depends on the mods