Hi, dompierrej7-

The minutes spent learning are determined by calculating the total learning minutes spent on the site. This does not include time spent navigating the site, time spent on non-learning pages, and time spent idling.

Teachers can view their students' total learning minutes through the Individual Student and Activity Overview Reports. More information on how to use these reports can be found in this article: https://support.khanacademy.org/hc/en-us/articles/360031052391

I hope this answers your question!