People tend to subscribe to Patreon when you release an update, and lapse when there hasn't been an update for 2-3 months.
More updates = more money.
The answer is probably "as many renders as you can make in a month."
But this seems like a reasonable place to start, if you need objective terms:
That's about 500 renders per month. If you can't do nearly that rate because of your computer or your skill level or the rest of your life's obligations, you might not be able to compete in this market.
That said, the biggest problem seems to be creators who didn't plan out their story properly, so they run out of ideas or gumption before finishing it. For this reason, you should spend time on brainstorming, outlines, and drafting, so you don't "paint yourself into a corner" later.
Good luck. And remember,
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