Renova (Retin A) Maintenance

I've been using Renova for 4 months now and love my skin. My questions is: after 6 months (that's when full results are visible) is there a maintenance phase (apply every other day or a couple of times a week) or do you continue to use the product every day?

I know the skin gets very thin so I am concerned that taking it everyday for years might thin out the skin so much that it becomes permanently damaged. Thank you for your time.

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