Even though the passuk (Shmos 18:13) says Moshe judged from morning until evening, Rashi says that this isn’t literal but is teaching us a lesson. Namely, someone who judges a true din, even for one moment, it’s as if he is involved in Torah all day and it’s as if he’s a partner with Hashem in Creation (where it often says, “and it was evening, and it was morning, day x.”)