Not much if at all, that's heading into VO2 territory. 2x20s are for sweetspot and around FTP. You -might- do 110% for an over portion of over/unders but that's likely going to blow you up, unless they're pretty short overs. For me doing steady state power stuff I don't do much over/under and when I do it's not big %'s away from FTP since I don't need to surge in my racing.
Not much if at all, that's heading into VO2 territory. 2x20s are for sweetspot and around FTP. You -might- do 110% for an over portion of over/unders but that's likely going to blow you up, unless they're pretty short overs. For me doing steady state power stuff I don't do much over/under and when I do it's not big %'s away from FTP since I don't need to surge in my racing.