Scheduling and ramping up wear time question

I'm starting waist training (specifically for my ribcage). I'm familiar with corsets, I have a comfortable one and I wore it for 7 hours with no issue (and no pain when removed). I can't find any info on how much time I add to my wearing at what rate, and what the actual target is. Just "wear it as long as comfortable, and increase as able".

Do I daily up my wearing by 30 minutes? An hour? So I stay at a certain amount each week? Is my goal 20 hours a day? 18? 22?

I am over 40yo so I know I have cards stacked against me for permanent changes, so I want to amen sure I'm doing everything right. Thank you for any advice!