Split shift is a stupid idea that needs to die. It only works for people who always work '9 to 5'. Work a different shift and you drive. Need to go shopping - just drive. Have a day off - drive to whatever you do. Going to church one sundap - drive. Have a kid who might get sick at school - you better drive everyday.

In cities with working public transport it aligns the schedules to accommodate the ridership. Which sucks a bit in the late evening when headways might become a bit long.

The absolutely largest peak is in the morning and then a smaller one in the afternoon.

So you might have a baseline like every 10 or 15 mins and then in rush hour it is every 3 or 5 mins.