I keep until they're printed, which usually is about 4 months. The only time I've regretted getting rid of them is when I wanted to adapt a couple of pages for a calendar and couldn't, so not that big a deal. I'm set in my system and don't plan to change it, but if I was making a change I might keep psds with the current year's photos until the calendar was done (ie, delete yearly instead of 3 times a year).
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