for those who want to check it up, its in shulchan aruch יורה דעה סימן רמו סעיף כא
it would be a good idea for the guys in bmg to learn hllchos talmud torah to see the way torah is meant to be studied in order that it shouldn’t be forgotten. many are able to learn כל התורה כולה before they get married like it says in shulchan aruch, or at least in the next few yrs but instead they spend a month on one blat gemarah learning every acharon, they hacking on every word, which even gedolim in the past generations like r’ shach spoke against.
sadly with this way of learning – torah is already forgotten.
but the bigger problem is the culture that people feel pressured to stay in kolel even when they are just wasting their time