How much % should we scale down intensity after every week of inactivity or rest?

I recall reading fitness drop around 5-10% every week of inactivity, is it correct?

I did just base work over the last 3 weeks and started back with butter yesterday @ 90% and plan to do the same with the other sessions until I do 4DP next week. I think it’s hard to say an exact % due to so many variables and if the drop is linear. Would a HM be an option to check where your at?

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