From the stickied FAQ:
http://www.flyertalk.com/forum/showthread.php?t=753436
e500 sweeps:
e500s should be automatically deposited in your account after each set of 10K BIS flown. The consensus is that e500s credit each week on Saturday evening, but mileage earned late in the week may not post in time to contribute to that week’s sweep [FT]. Attempts to get UA to post e500s early have generally not succeeded.