Well, Goob, she's had 'em a loooong time, that's for sure. She got them in late
1990 ! According to Crystal, the funny thing is, she kinda got her implants by "accident". That is, she didn't really specify a certain "size" of implants with her surgeon and the (huge) pair that she got were (as far as she's aware) the "last on the shelf", so to speak. The rest, of course, is history...

She has had them longer'n Pandora but, presuming that Morganna still has her original set, its not the longest.