How often do you drain your air compressor?

After neglecting my 60gal & acquiring pin holes in the bottom. which I fixed. Now draining is my new religion, installed 1/4" ball valve attached to poly tubing that goes out the wall vent. I find that draining after use is not enough. After use it takes a while for all the moisture to end up in the bottom of the tank. So sometimes it's necessary to Crack the valve when I walk by.