I think it is because they have to sit and watch video presentations whereas in the past elders got up and presented talks. Now it's watch a video, discuss the video, and then see if the conclusions in the room agree with the 2nd part of the video which tells them how to use or interpret the 1st part of the video.
If you have to do that for each of the chapters in the elder text book. Yawn. 4-5 days easily and usually from 8.00am to 5.00pm.