How much time do I have?

[Jkm14j]

I’m 19, just started Fin about a week ago. Over the past month, I’ve started diffuse thinning very aggressively. If Fin doesn’t end up working (I’m trying to prepare for the worst), how much time do you think I have before I have to shave it? MPB runs on one side of my family (mom’s).

https://imgur.com/a/g1uV2UJ