Gavra
1. The Ran in Nedorim says the Gemora means it is bedieved if it was a very busy day.
2.There are many different levels of Talmidei Chachomim look in Brochos 47b and I think Sotah 22 or 23, and the Poskim agree that in our days at least for Halachos of Kavod Talmidei Chachomim there is a din of Talmid Chochom. ANyone who is Omel BaTorah and Ro’uy L’Horos and is not mezalzel bemitzvos and has glatt hashkofos.
3. Anyone who was in yeshiva and learned a full day will not be a ble to describe you 1% of the Mesikus HaTorah how they learned for hours and days and nights on end. t doesn’t compare to a guy who learns half or three quarters the day and who has fifteen things on his mind.