Many years ago, I flew over the Sahara 6 times in a week. Another
CWSish travel programme had me flying LHR-DEL Y out J return 4 times in 9 days and when I arrived home after the last one got a phone call about an hour into my sleep catching up time to go to SYD that night

.
Another one burned into memory was LHR(LO)-WAW(LO)-SZZ(LO)-WAW(LO)-FRA(LH)-MNL(CX)-HKG(CX)-LHR all in a oner.
Oohh, those were the days and that is just a small sample.
I blame all of that flying on my expanded waist line..........
Safe & Happy Travels
S