I do most of my winter work indoors and find it hard to hold 100% of FTP for 20 minutes because I overheat and get bored..... No need to worry about me doing SST work at 100% of FTP this winter
I have found that I can do 80-90% of FTP for 15 minutes (x4) twice a week on the trainer and recover fine the next day..... With that said I cant wait for DST to start!