How long should I follow the precautions after an acne treatment to maintain the effects?

I'm considering getting an acne treatment, but I'm worried because I heard post-treatment care is really important.

I'm even more worried because I heard that the effectiveness of the acne treatment decreases if you don't properly follow the post-treatment precautions.

I'm wondering when I can wash my face or wear makeup after getting an acne treatment, and I'm also confused about how much sun protection I need to take.

I'm also curious about when I can start exercising or using a sauna. I'm worried that if I just go about my daily life without thinking, it might flare up again, so I'd appreciate it if you could tell me how you actually managed it.