Here is the response from Lew at cj regarding the 6922's and issues re the GAT on tube life.
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The 1500 hour number is just a rule of thumb for pretty much any of the miniature tubes. Much more than that and you will probably find sound quality degrading (typically a softening of highs and blurring of transients). You may also find issues with the tube going noisy. In any case, there is nothing particularly unusual in the way the tubes are used in the GAT (other than the absence of feedback - but that is the same as in the ART).
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All I know for a fact, I got a lot more useful life from 6922's in my prem 16 and ART pre amps. Either I am extremely unlucky or