My weekly limit resets at 10am on Monday. My current (Sat, 11am) usage is 23% used. Now I regularly used to run out of credit on a Saturday, about a month or so ago, but I've actually been thinking of reducing the package to the 10x because recently I've been nowhere near.
This is with 3-4 agents constantly (even when I'm asleep) working away - it's hard to get them to do a full nights work, but I generally leave them with Big Problem^TM to solve overnight and we take it from where they left it in the morning. Sometimes they've even done it....