i do travel ~3-4 weeks/year in total and do have to work more occasionally. I hold 7-8AM, 5-8PM as sacred for my young kid. If I need to get more done, I wake up at 4:30 or get it done at night in lieu of the reading. also have calls late at night but generally able to schedule b/w 8-10PM.
but yea, I'm lucky. many have to travel more / work more hours.
also helpful, I've optimized for a short commute and work home 1-2 days/wk.