Originally Posted by plantrob

Depends on the rest between those 3x20min at FTP, I would think. In any case it would be hard, but with 10 min easy between each 20min session, I think it would be doable. I'm assuming here that OP's FTP is based on a 20-minute power test, so that he's been able to put out 105% of FTP over 20 minutes at least at some point in the recent past. This would be three slightly less intense intervals, with some rest in between. I'd expect to see some fading from the first to the third interval.