Here's a scenario to show you how it could work.
So say you're arriving really late on Friday, and leaving very early on Tuesday...so in this example, you'll be there 4 nights - Friday, Saturday, Sunday and Monday nights. That will give you 4 TS, 4 CS & 4 snacks per person. But due to the late arrival & early departure, you're actually only there for 3 full days.
Since you're getting there late on Friday, you won't use any credits on Friday. So you could have a 2 TS meal like Calif Grille on Saturday, then do 1 TS restaurant for dinner on Sunday & Monday nights. Or you could schedule 1 TS meals all three nights for your dinner AND have a TS breakfast one of those days -- like do a character breakfast buffet one day.
You can do counter service lunch on Saturday, Sunday & Monday...plus since you didn't use any the first night, you have another counter service you can use for a breakfast on any of those days. Or if you have time on the day you leave you could have counter service breakfast at your hotel before departure.