Preparations for truth have no set time span.
All accords with the person, his time, and his place.
The Hasidic rebbe Rabbi Yitzchak Meir of Gur prayed five or six hours a day.
Once, after completing his prayers in a single hour and seeing his attendant’s surprised expression, he told him: “You think we have to pray for six hours? Sometimes you can reach your destination in a short time without obstructions.”
—Rabbi Adin Steinsaltz