Peaked at 68 in July, currently 36 after pretty much 3 months of various colds and bugs. Came into last year much higher as I did the rapha 500 and the winter gorricks. Still, first year of training with a power meter and turbo so expecting big things as opposed to my usual ride whatever I want approach to training.
FTP is the same as October at 265 so I haven’t lost the power over winter despite lack of training.
Longer sessions seem to impact it much more than daily 1hr sessions, I used to do similar hours a week but mostly at the weekend and my fitness / fatigue figures were much higher.