It'd be more accurate to call it a logarithmic relationship, since compute time is our input variable. Which itself is a bit concerning, as that implies that modest gains in accuracy require exponentially more compute time.

In either case, that still doesn't excuse not labeling your axis. Taking 10 seconds vs 10 days to get 80% accuracy implies radically different things on how developed this technology is, and how viable it is for real world applications.

Which isn't to say a model that takes 10 days to get an 80% accurate result can't be useful. There are absolutely use cases where that could represent a significant improvement on what's currently available. But the fact that they're obfuscating this fairly basic statistic doesn't inspire confidence.