Pre bubble crash and when I was trading OPM 20k days were no problem with a max around 150k. Risk arb were basically a gold mine, JDSU-SDLI I think came in 50 points in one day after JDSU got added to SP500.
Post bubble not trading OPM, 25k in one day is the max it seems each year except last year when I put up 15X that, and I am pretty sure that a lot of other people that day did as well.