@MM according to the TX board website for my score it looks like they received my score on 12/17/10 (granted i didn't get it until the 20th bc they don't post over the weekend for us in TX) so my credit will expire on 6/17/12. So it looks like it's 18 months from when the state board received my score.
REG-80, 77, 77
BEC-67, 68, 71, 67, 71, 74, 71, 74, 72, 77
FAR- 72, 65,67, 53, 75 (truth be known the 53 was with 4 hours of studying)
AUD-58, 62, 72, 74, 74, 75
took 5 years but I'm DONE!!!!!!!!!!!!!!!