I find that it helps to minimize outside activities.
If I can't minimize them, I try to consolidate them.
Anyway, here's what we've got planned:
speech therapy (2x/wk)
piano lessons for DD#1
violin lessons for DD#2
religous ed now on Sunday after Mass! We were doing RE in the afternoons -- very disruptive.
Scouts -- every 2nd Wed lunchtime for DD#2. Friday evenings for DD#1.
So, depending on how the schedule gets arranged, between 2 and 4 broken up days each week.
It would be GREAT if we could, for example, do Speech Therapy Tues/Thur at 9 a.m. and music lessons at 10 on the same days. But ... it rarely falls out that neatly.