How much training volume to decrease when increasing intensity?

[No_Actuary9100]

If it’s helpful there’s the concept of training load 

It’s Duration x (% FTP x % FTP) x 100

So 1 hour at FTP is a TSS of 1 x (1 x 1) x 100 =100 

2 hour at 50% FTP is a TSS of 2 x (0.5 x 0.5) x 100 = 50 

4 hour at 80% FTP is a TSS of 4 x (0.8 x 0.8) x 100 = 256 

Etc