What? Working 8 hours a day leaves about 8 hours of freetime to spend with your kids even leaving 8 hours for sleep. Even if you change the numbers there is plenty of time to spent, it is just matter of prioritizing.
This doesn’t make any sense. Kid wakes up at 7:00, you have 1 hour for breakfast and to get ready for school/work. Then you’re back home at 6:00 and you’ll have another hour for dinner and getting your kid ready for bed. So this leaves about 30 minutes to spend time playing with your kid on an average weekday.