Children are great, but by the time they are interesting enough to spend all day with, they're old enough to start attending education. Of course, people can u

Children are great, but by the time they are interesting enough to spend all day with, they're old enough to start attending education. Of course, people can use the time to homeschool if they like - probably a good choice for many - but the real rewards for spending time with kids (for a working dad) is probably increasing from ~1 hr at night before bed to ~3 hrs including morning, something during the day and the nighttime routine. After that the marginal returns do decrease. Playing endless toddler games does tire compared to learning a new skill.