I did some twelve hour shifts when temping at a colour matchers (this was quite fun) but anything involving problem solving/liaising I'd be flagging towards the end of that.
I remember in my early IT career when there was lots of overtime (for the British Telecom sell off). I did my normal programming job then evey evening until about 22:00 was overtime doing clerical work (at 1.5 x my IT rate of pay). Then all day Saturday at double time and Sunday at 2.5 (or treble) time.
By every Monday morning myself and a colleague would be ahead of all those who had been home for the weekend. Really noticeable how dozy they were. Next thing we knew was that by the afternoon we could not keep up with them !.
It was stupidly long hours for many weeks but it got me a large chunk of the deposit for my house.
On a manual job front decades later and I was involved in the annual summer factory shut down 10-14 full days. Absolutely exhausting MANUAL job and I decided on early retirement before I had to do it that last year !.
I think I'd prefer 5 8 hour days than 4 10 hour days to be honest. Probably true of any job that involves a lot of thinking!
Might be different if the job was a bit more menial e.g. working on the till at Tesco.
I ended up working 10+ hours per day for four days per week. Pity the strike day was a Wednesday and not bolted on to the weekend !. I was a programmer and the longer days gave me a chance to get into something and solve it. In fact I would often work late to finish something I was in the middle of anyway. I suppose that is a feature of a creative job.
Perhaps the suit isn't if you pay a fortune for a made to measure Italian one, but I find off the peg suits rarely fit well, and shoulder pads are awkward.
Formal shoes (if you're going really formal, e.g. brogues) are an unnatural shape and damage your feet, though to be fair I wear a pair of wider, less formal leather shoes to the office which are reasonably comfortable.
A tie? How can having something tied round your neck *ever* be comfortable? It's the most stupid garment ever conceived.
Shoes hmm, the worst I had to endure were safety boots. We did a lot of walking around site and I hobbled around when someone who did not have to wear them decided we additionally had to wear puncture proof soles - inflexible. My knees were aching as well. It is one of the reasons I retired early.
Tie - I once came to the conclusion that a tie was invented to collect dribble and food that failed to go down the throat - thus leaving the garment underneith relaively clean.