I call it asymptomatic.

Just like everyone, I have better days than others but this has very little to do with the disorder and more about life in general. I track my mood and if I see any patterned change (something that lasts more than a couple days) I am on the phone to my psychiatrist for a med adjustment. The length between episodes for me right now is quite long. I have maybe 2 major depressive episodes a year and they don't last very long.