How often do you drain your air compressor?

For me what made a difference was replacing the drain petcock with a 90 degree fitting that accepts a 3/8 ferrule to a copper line, that runs up to about 40" I have a 1/4 turn ball valve mounted there and the discharge goes back down to a 2 liter soda bottle... So I don't need to bend over, I just crack the valve...

I use to have an auto drain but it failed... This is cheaper & works great..