The thing of the Litvaks is learning in depth. I had a friend who became the acting rosh yeshiva of Chaim Berlin Yeshiva in N,Y. that told me once he saw no point in ''bekiut'' [fast learning-saying the words and going on.] This point was brought home to me over the years --first by Motti Freifeld in Shar Yashuv and later then in Uman when my own learning partner David Bronson refused to "go on" until he got the subject perfectly.
I believe this started with the Gra because it is the most obvious and characteristic thing about the Litvak world that goes with the Gra. I am beginning to think that this sort of learning in depth is the only possible way to get to the light of Torah.
But at the Mir in NY there was the afternoon ''bekiut learning'' which also makes sense to me--but only if done along with some sessions that are done in depth.
I might mention that my son izhak ben avraham held with in depth learning.
Other lessons I learned from him: (1) exercise, (2) the importance of following the path of the Gra in every detail--including the signature of the Gra on that letter of excommunication. (4) Not to be hard hearted. like it says in Torah about the brothers of Joseph that he pleaded with them but they were hard hearted and sold him. Also with Naval HaCarmeli who was hard hearted when the men of King David asked for help. In fact, this last lesson seem to me to be the most important one that must learn from the life of my son. (5) Shmrirat Habrit - to keep the laws of the Torah concerning sexual issues like it says in Leviticus chapters 18 and 20. [ And not to add them what is mentioned there.] (6) Coming and staying in Israel. [This is also mentioned in Torah in the verse in Deuteronomy ""Keep the commandment so that you may come to the Land of Canaan and that you may have length of days in the Land. [Parshat HaYira at the end.] (7) He also had inventions which he never published. so, like my dad, he had an interest in mechanical engineering.