I do 4x week, Mon-Tues-Thurs-Fri. At 40/yo the 3 days a week of rest is good. I did 3x week a couple years ago, Mon-Wed-Fri, and it was good as well. It just depends on schedule, sounds like yours is complicated with travel. For me my work week is easier to stay on schedule and use sat/sun as overflow if I miss a day during the week. For example this week I can't lift on Friday so i'll do it Sunday. Monday a new week starts all over again, week after week, pr after pr, i love it.