That's not really the right way to look at things.
Both parents should be getting roughly equal amounts of sleep/opportunities to sleep.
Both parents should be getting roughly equal opportunities for physical care (washing, grooming, exercise, eating, drinking).
Both parents should be getting roughly equal opportunities for hobbies, friendships and leisure time.
And in households where there is a SAHP but both of them want to have an equal relationship, both parents should have the opportunity to develop the skills and knowledge needed to look after the baby without help, and both should have the opportunity to develop skills and knowledge to develop their earning potential.
How those things get sorted out depend on where you live, what you earn, what sort of support you have from other people, what jobs you do, how many other responsibilities you have, how much the baby sleeps, how much care and attention the baby needs.