Gravesite of Rabbi Yochanan ben Zakkai in TIBERIAS
It says of Rabbi Yochanan Ben Zakkai: All his days, he did not have a conversation not related to holiness. And, he did not walk four cubits without Torah or without Tefillin. No one came before him to the Beit Midrash and he did not sleep in the Beit Midrash, not scheduled sleep and not naps.1
1 http://www.breslev-‐midot.com/eng/enlarge/album05_27.jpg