How often do you charge your phone?

I charge my Samsung phone for almost every other 3 days. I'm not a heavy user of my phone since most of the communication that I do is based on letters, announcements from our boss through meetings, and the like. I even forget that my phone has been asking me for a charge since it's almost draining (which I know is unhealthy). But if I'm going for a vacation, I have it on full-charge, and on the place where I'll have a vacation, I make it sure that I am always in full-charge.