I can't comment on the Archon use of tubes, but I can speak for decades of many tube amps used by me and others, and how long we had our tubes last.
First, great or even good preamp tubes can and should last for years, even cascade setups. I have friends playing pro who haven't had a preamp tube issue in a decade or more. Yeah, a rare one can go microphonic for no apparent reason, but at the voltages these tubes operate at, if you are having to change them out a lot there is something very wrong. Example -- I have this one beastly heavy Pro Tube Twin, on wheels thankfully, been across the US twice, bought in 2006 I think, put in some extra spec from Tube Dr in V1 and in another socket when bought. I have not needed to change any since. No issues.
Power Tubes? Rule of thumb is, if you gig hard with the amp, new power tubes needed every 6 to 9 months, depending how loud you play.
Bedroom use for power tubes at medium to low levels, you should get at least 2 years out of a set. Loud amp in your living room, at least 1 year.
I have used most of the popular brands, don't bother with NOS, and aside from some tonal differences, I find they are all about the same in lifespan and quality. Oh, I I run my power tubes only ever so slightly hot but not frying them.