With varying setups, I got varying results.
Putting 5 girls on the left side loop gives a good chance at staying near 5k it seems, but I've had 4,300 from that setup as well.
Placing 5 girls at the top also can go as low as 4,300 (or even a little below that), but has a much higher potential. Provided all girls, one way or another, enter the right side loop, and stay in that outside loop with the burgers for a couple of rounds. Personal record is 5,900 there.

Overal, I generally go for the default setup, avaraging me about 4,750. (crude guestimate). It's usually less, but the couple of peaks do raise that avarage by a lot.