I travel frequently. We have a routine, I call first thing in the morning for a quick "good morning" and we spend anywhere from 10 -45 minutes on the phone at bed time (when my 8 year old tends to be the most talkative.)
I will often be out of town, usually for 3-5 day trips 3-4 times a month... but my job pays enough for DH to be the at-home parent. When I am home, the chores are done, the house is clean, the shopping, laundry etc. all done so we actually have time to play as a family on the weekends....
How do I not worry? I know my DH would do anything and everything to keep our son safe. I trust that. But if I ever try to call home and no one answers (when I don't know in advance they will be out) I do panic a bit....
I think the weekends without all the housework and errands to do makes it worth it.