I don't work (#lazy) (actually a stay at home mum), so by some logic I should be doing all the house stuff and kids stuff coz my DH is working full time in his proper person job.
What we actually do, is that if he's working, say, 40hrs a week (he works weird patterns, so it's not so straightforward), then for his 40hrs, I'm also "working" 40hrs. Which is usually all the childcare for the younger ones, their clubs, appointments etc, plus whatever other family stuff I can fit in - shopping, housework, whatever. I don't sit around having "me time" when he's at work. I fill the time with kids and jobs.
When he finishes work, or before he starts, and we're both around, we look at what needs doing and get it done. Between us. Neither has more "time off", because we've both been pulling our weight during working hours, so we get the same time off. If I plough through house stuff some days, then we have a really chilled evening/ weekend. If one day the kids are chaos and have loads of activities I'm carting them to etc, then I won't get much housework done, so DH and I split it when our "working day" ends.
Sometimes he'll work evenings, even I don't have kids to deal with and frankly I want to relax, so then I just make sure I don't leave an unfair load to him some other time, and make sure he gets time to relax on his own the next day or whatever.
We don't count it to the hour, but we each value the others contribution to life, so we both don't mind doing what's left to be done around the house. And the quicker it gets done, by two, the more free time we get as a family. Win.