On Khan Academy, how can a student earn energy points but earn no "minutes"?

This question is for anyone who has been using Khan Academy to study: How could a student show “0 minutes” ever earned on Khan Academy, and yet have earned 650 energy points one day and 850 energy points another day? I am a test prep tutor, and many of my students use Khan Academy. As their “coach,” I can see a chart showing how many points they have earned and how many minutes they have spent. I have tried asking this on the Khan Academy’s discussion site, but received no responses. This board seems more active.

I believe the minutes are only for watching videos. If you’re only doing practice questions, it does not accumulate minutes.

Edit: Wait, I could be wrong, this page seems to suggest otherwise
https://khanacademy.zendesk.com/hc/en-us/articles/202324084-How-does-Khan-Academy-calculate-time-

Thank you for your reply and for the link. It’s still a mystery, because in each of the two types of reports mentioned, the student shows as having spent zero minutes, yet somehow accumulated points.

Sure, no problem.

I’ve only ever used Khan academy as a student. As a coach, can you see what they earned points for?

No, they don’t let you see the actual exercises, etc. that the student did. It makes it a bit difficult to coach people on problems when you can’t see what they are doing. It doesn’t therefore work as a source of homework to discuss with the student. It can work somewhat as a way of seeing whether they are doing any work at all, and how much, but even that is problematic if you get a report showing zero minutes and 1500 energy points earned, you can’t exactly “bust” them for not doing any work. Kids probably have the system so gamed that they could work around it anyway!