Yeah I just do short haul. The reason why they say to not fly for 6 weeks is due to the risk for DVT that can occur on flights.
Your risk should have decreased significantly by the time you go away, though I would tell you to take precautions; such as moving around more on the flight, do the exercises, drink plenty of water, and maybe even take an aspirin and wear the compression socks.
As I’m up and around all the time, it’s different for cabin crew flying to passengers. We just have to be off work for longer due to not being able to do heavy lifting. I was off for four weeks.
Hope this helps xx