I do a combo/hybrid commute...
If I biked the whole commute, it would be 25 mi each way and the last 5 miles on the return gain about 600'. To get home at a reasonable hour, I park 18.2 miles from work and bike commute from there. I also have options at 15 and 12.5 miles.
There's no question that it cuts into family and sleep time. Sometimes I cope by taking a nap at lunch hour. Otherwise, I'm resigned to very little personal time at home. Last night was a good example: today is trash & recycling day, so Tuesday night always has about 45 minutes devoted to cleaning the cat boxes, collecting and putting the trash and recycling curbside. Then the usual things: time to clean up the kitchen after dinner (Mrs. K had a pm meeting so, while I usually help out, I had it all last night), put Miss K to bed (includes bedtime reading), make lunch for today, do a load of laundry, get clothes ready for am commute, 1 hr of couples time with TV & Mrs. K, get ready for bed. I got up 10 minutes early to have the time to get the bike ready and onto the car. This is not a complaint; I have a family because I want one and acknowledge the investment required to maintain one....
The bike time is important enough to me to fit it into the schedule. When I had a 55 mile commute, I did the bike for the last 15 miles. I got a 50 - 55 minute bike ride and it added about 30 minutes to my commute (each way). It's about the same now with a 75 minute bike ride which adds 45 minutes to the am commute and ~ 30 minutes to the evening commute (avoids traffic slowdowns.)
P.S. I try to be philosophical about commute distance; it's not for ever and there's always someone who has it worse. The oldest part of my house was built during the revolution. After the civil war it was owned by a whaling ship captain who sailed from Sag Harbor on Long Island Sound. I live in Northen New Jersey, about equidistant from the Delaware and Hudson Rivers. That captain had to travel 153 miles one way to get to work and I can only guess he walked, took trains, hired carriages, etc. and that it took more than one day. Of course, his voyages lasted as long as 2 years, so he probably spent less of his life commuting than I do, but I sleep in my own bed every night.... Whenever I grumble about my commute, I think about his....