Excellent point, and to build on it:
Just because the elapsed time was 2000 years does not imply 2 years of study at a fixed hourly class time is a meaningful metric for what we're talking about.
The history of discovery and how ideas were constrained in the ancient world and the time it took to discover ideas is not related to the fixed-time dedicated study of the topic. The connection is totally meaningless.
Some measure of units of information would be meaningful. Discussing discovery and the established discipline as isolated things (or describing how they could be connected in that context) is meaningful.