Being a yeshiva bochur I can say that Bein Hazmanim is much too long. The only way to be Melamed Zechus is to say that they make it too long to give a chaishek to go back.
I once heard that every person Kifee Madraigaso goes down one Madraigo during Bein hazmanim therefore a person who learns 18 hours a day will learn 15 and so on. For Bochurim that don’t learn even during the zman, and only look like Yeshiva Bochurim, they’re only outlet is to not even look like Yeshiva Bochurim. I think that’s the way to look at it. Have A Great Zman Everyone.