There are usually between 6 and 10 different attendants employed, working the rotating shifts, almost 24/7.
There are 3 shifts/day with 2 girls working each. Potentially 6 different ladies coming in each day, however, double shifts are common as well.
Maybe that's helpful.
I only know this for having worked there in the past and that is my experience when I did. I'm quite sure nothing has changed much in the last 7 or 8 months in the way of scheduling, other than the staff.
Sydney