Realbrisker – Moed Katan 28a the story with Rav Ashi where he told the Malach Hamaves he needs 30 days more to review all his Torah – Ashrei Mi Shebo L’kan v’Talmudo B’yodo.
Not V’Shticklech Torah B’yodo. We have a chiyuv to (at least attempt to) learn Kol Hatorah Kuloh.
There’s a great sefer called Kerem Yehoshua written by a Rav Yehoshua Cohen Shlita on Derech Halimud – where he writes in his introduction that Choshuve Rabbanim and Magidei Shiur have called him literally crying that they feel they are living a lie as they are respected as Talmidei Chachamim when they in fact know so little as all they learned all their lives is HOW to learn and give good shiurim but with no real Kinyan in Torah Knowledge.