Relaunching Finder

How often should I need to be relaunching Finder? I'd have thought the answer would be “almost never”. On my Mac Pro, which is up constantly, pretty much rebooting only when required by Software Update, and often sleeping overnight, Finder is wedging itself (by which I mean becoming almost completely unresponsive to user input) about every two or three days. Days. Relaunching Finder fixes the problem, but this seems ridiculously frequent to me. In comparison, my MacBook Pro, which is up about as constantly, but maybe sleeps more, basically never requires a Finder relaunch.