We both did 30 hours, three full days and two short days each. The one doing the long day did the school drop off, the one doing the short day did the pick up and made dinner, etc. On the day we both worked a long day, grandparents picked up or they went to after school club.
In the holidays, we each booked our short days off, so it cut less into our leave and we were lucky to have their grandparents look after them again one day a week.
We went up to 33 hours when the kids went to senior school, we didn't need to do the school run any more, but most days we were here after school (or shortly after) for them. When they were teens they did disappear to their rooms, but I know they were glad we were here when they'd had a bad day, or just wanted a chat.
This worked really well for us, we shared the load, were there for the kids and weren't too far off full time. In fact, I still only work 33 hours, even though our two are young adults now, I am used to the salary and appreciate the extra time for myself.