This a fair point, one that my wife always makes to me. I guess I just feel like I can do better? I know other dads who have plenty of time consuming hobbies -- they seem to fit it all in, why can't I?
Don't compare yourself to others on a single variable, like hobby time, when you'll never know what all the other variables look like. They may spend less time with kids, put more of the parenting on partners/childcare, have more money, work less, do fewer chores, etc. I personally don't know any dads with kids under 5 that have time for hobbies.