I've found Pat's 3-day classes to be about 1k-1.2k rounds. Divided up, that's about 400 rounds/day at the outside. If you have 15 (20 is better) serviceable mags and load them up at night or in the morning before each training day you'll save yourself a lot of headaches. Be sure to have at least 2 empty magazines for various drills where you'll download. Not having to spend breaks jamming mags means being able to spend them hydrating, snacking, and resting.
As mentioned, known functional carbine and handgun, spare for each, known functional ammo, and lube.
I am also a huge fan of pre-hydrating the week leading up to the class and at night an in the morning before each training day.
Finally, get your gear squared away as best you can before class. Put on EVERYTHING you intend to carry at class, including slinging the rifle and holstering the pistol, and make sure you can get to everything and one thing isn't covering up another. I saw the same guy for two years straight show up with the same vest and holster combo where the vest covered the holster. As I tell our match and drills shooters "un-f@ck yourself before you get to the range".
and have a great time and tell Pat I said hello! I'll be seeing him in December down in Lakeland myself.