When I used to work on a job with a lot of flying, business class was only paid for If the flight was 10 hrs or more. We mostly flew to Europe and NY so no one ever got this.
The worst was the regular trips to company HO in New York . I went every couple of months for 3 days It always went
Mon go into work, 5pm taxi to Airport for a an evening flight.
Arrive evening, eat dinner, sleep ( well try to, usually woke in the night with weird jet lag)
Work Tues to Thurs in HO staying in the attached company owned flat at night
Thurs 5pm. Leave HO taxi to JFK for the red eye flight
Arrive UK airport early morning in Fri .
Taxi from airport straight to UK office
In for around 9am l. Work til 4pm at the earliest usually 5/6pm. Go home and spend the weekend recovering from the jet lag
I loathed it. They refused to pay for business class which might have meant we got some sleep coming back but they insisted we come to work .no going home to change/shower etc on the Friday and no early finish either
I still remember the exhaustion of those weeks and I was young and childfree. I used to fall asleep in the taxi from the airport to the office!!
Travel for work often sounds much better than it is, especially if you are junior in role (as I was then)