Average FTP depreciation rate per day known?

I know on Xert it runs a -1watt loss per day if you’ve not been on the bike, but no clue if that’s worth anything.

Say you do nothing, is there a linear or non-linear depreciation. What if you do endurance only, does that mitigate the depreciation over no riding.

Is this stuff known/studied or is it too wildly different between people?

Maybe not the hard numbers you want, but this is a good reference:

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Wasn’t expecting the residuals from threshold work to be so long. Up to 20 days! Very interesting…

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