Each plan has a number of commentary minutes a day. When you run out, you’ll see a message like one of these:
Daily session limit reached (15 min for free tier). Resets at midnight UTC.
Daily session limit reached (15 min for free tier). Stopping commentary.
Your minutes come back at midnight UTC. That’s the same moment everywhere, so it may not be midnight where you are.
Free has 15 minutes a day, Pro has 60 and Mythic has 120. See plans.