I’ve noticed that a great time to Chazzer is when it is not fresh in your mind anymore, but before it is completely gone. This way you get to have a fresh look at the Sugya while reaping the rewards of what you put in last time.
When doing it this way you see clearly everything that was confusing before. This is what Chazal mean by Halomed V’eino Chozer Kizorei’a V’eino Kotzer — One who learns and does not Chazzer is as one who plants but does not return to cut his stalks.