Every couple of months. My husband works overseas so sometimes he comes home and sometimes I fly over there. Usually Istanbul but sometimes Dubai. He's a petroleum engineer so the mid-east is where the jobs are. At least the jobs that pay what he makes. #
We have a couple more years before he retires but I suspect we'll be traveling even more then. The flights to Dubai are 26 hours or so flight time with a copule of changes and short layovers ( if I can ge the good flights). Istanbul isn't quite so bad. One stop in the US and one in London.
One good thing is that in a flight you will usually tend to use lower brightness, probably lower than 50% but YMMV. That should help quite a bit.
The other is you could carry a small battery pack which maybe approved for air lines.