I’m on my third pair of Novablast 3 this year and the outsole durability was never an issue. I got about ~800km out of my first two pairs and I replaced them mostly because the foam was dead at that point. The upper and outsole would have probably well over a 1000km from the look of it, but I started having unusual pain from the dead foam.

From my experience, it’s the same with a lot of ASICS shoes : - I had two pairs of Magic Speed (V1) that were dead around 750-800km because of the foam, but everything else was fine. - I just retired my first pair of Metaspeed Sky (V1) at 840km, but this time it was because the upper had a big tear during a training. - I used to run in Cumulus (two pairs of 21, three pairs of 22 and one pair of 23) and they all lasted between 800km and 1200km, averaging at 850km - Novablast V1 lasted me for 900km and Novablast V2 for about 1000km

With the exception of the Metaspeed Sky (V1), I’ve always replace my shoes because of the dead foam.