I do a 9:30 to 7 instead :) Waking up early sucks.
Gimp, we are exact opposites! I try to be done by 4pm, 5 at the latest so I can have freedom nearly every evening.
But, in short, for the OP....yes, I tough it out. I could explore a 4-day per week schedule, but my pay would be cut by 20%, which would push out FIRE...no way! I also WFH which helps, and try to keep myself motivated by tracking things like budget cuts and FIRE status.
I have also started focusing on some other goals - home improvement projects and some upcoming travel - so that FIRE isn't my only big goal. For the past 18 months it has been a bit all-consuming, and I need to do a better job of ensuring I am not just focusing on the long term to miss the short term.
But, yes, I do find it bananas that regular work hours are just "expected" to be 9-5, M-F....it is a total drain by the time I get to Friday! I am convinced that if I had Wednesdays free each week, I would easily make up for it in gained productivity during the days I am in the office. No way in hell can I raise to management though, or they would start to suspect I am not the "gunner" that I seem to be.