According to my sensors, it had been approximately three months since I had started to teach Rhea. Of course the meals that I had to make for her were good indicators of time but I preferred the hard data that my sensors gave me.
I had started a timer immediately after we had reoriented ourselves meaning there was maybe an hour or two margin of error but not enough that I would mess up how much time had passed.
Moving on from that though, Rhea had made remarkable progress in the time that I had been teaching her. She had gone from a barely educated apprentice to one I would be proud of.
So much so that from what my innate aether sensing abilities showed me, no matter their disuse, she had advanced to tier 7. Not from the knowledge, no, Rhea had advanced because of the enhancements that we had worked on together.