RebE> should examine his actions and if not found a reason, than the fault is bittul torah.
Find me someone who paid all his workers on time first (as with R Huna there) and then we can ask him about bitul Torah.
I do like Avira’s definition of mental capacity for learning (limited, but hopefully increasing). So, after you are exhausted your learning capacity for the day, you can come to CR. I think many of us are already following this advice!
Seriously, CR references provide sufficient material for learning. And major part of learning is being able to defend your views against a worthy opponent. R Yohanan would have stayed sane and alive after Resh Lakish petirah if he could have logged in here.