How often do you replace your line?

[Feydakin]

Since I've been doing a lot more fishing in the last couple of years I've started coming up with more and more of what I figure are basic fishing questions.. (no one in my family really fished when I was growing up so I'm starting fresh at 40 years old)..

Anyway.. I assume that line should be replaced every so often.. I've been mostly using lightweight mono on two of my rods and a #50 braided on my Muskie / Pike setup.. With things atrting to thaw out around here I'd really hate to loose a fish because I was cheap on the fishing line
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