Yep, bring up an old one here...
PFT's have to be taken at a minimum, semi-annually (First half: 1 Jan-30 June and Second half: 1 July-31 December). So depending on when you take it, your score could be good for as little as a day or two or as long as six months. Some jokers like to really torture themselves for a month or so, then take their first half PFT at the end of June and their second half PFT in the middle of July so they can be fat, dumb, and happy the other 10 months of the year.
Average post-boot camp scores vary greatly. Some motivators run 300's, other scumbags barely pass. So they hit both ends of the spectrum.
