Herron VTPH-2A phono preamp owner's advice.

Okay members, I couldn't stand the suspense any longer. I had to find out for myself if the stellar reviews on the VTPH-2A are overblown or indeed honest. I ordered a unit yesterday and it is on Herron's schedule to be built. Hopefully I'll see it sooner rather than later. Anyways, the question I have deals with tubes. I've never owned any tube equipment, only solid state. Does anyone have a clue as to how long the stock tubes should last? I know that folks will want me to tube roll and there will be tons of advice on which tubes to purchase. I plan on following the advice from Herron and simply stay with the stock tubes.