How long should Pre amp (12au7) tubes last in Rogue Preamp?


I've always heard Rogue equipment drives tubes hard. My RP-5 (purchased in OCT 2017) still sounds great with the stock JJ's. No distortion or any added noise. Typical life (in hours) of general 12au7's for a Rogue preamp? I may try the newer Gold Lions next time, although I am happy with the sound of the JJ's
aberyclark
Thanks for the info. I may purchase a set of Gold Lions sooner rather than later so I have working back up tubes.
I think replacing the tubes prior to a need to do so is a good idea. Having a backup set is handy and you may rediscover your preamp.