What is an accurate timeframe to see if results will be permanent after having IPL treatment?

hi. I got one treatment done with max g ipl for diffuse redness skin type 3. 34 joules , 15ms. my heard area I have patchy hair loss. I read some say it can be 3-4 months or 6-8 weeks ot see if it is permanent. since hair grows in cycles what would be more accurate time frame. if it is perm. then i guess will have to have do it again to get rid of rest. cant leave like this. my mustache and chin were not lasered. next time if grows back i will have them avoid beard area. thank you

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