Hi @brittair ,
Unfortunately, yes. Because as mentioned on that other topic:
But the good news is that you only need to fit the classifier once (hopefully), and then you can re-use it in your environment many times, no need to repeat this step.
You can also just fit the classifier with q2-feature-classifier if you do not want to perform the evaluation steps. This will save you some hours of additional time. That's the step that is parallelized by the --p-n-jobs option, though, so you can leverage your hpc to speed up that step.
Sorry I can't give a more satisfying answer!