It depends where you go, and the time you spend. Its possible to get more than 20k, if you go to cuba or governor's garden (or at one time at least). Both places at one time gave 1k or so an hour, meaning the 24 hours you described would be 24,000.
and to answer your question, I haven't had over 6k in a while, and when I did, it wasn't often.
Happy 4th as well
