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Depends on what you mean... if you mean spending many hours just to beat it once then no, I haven't.
If you just mean total time spent fighting a boss no matter how many times, well.... I've grinded lots of Borderlands bosses for hours on end for that sweet sweet loot to name one example. =P
I have, though not too many. My bf and I usually don't have too much interest or opportunities to go or do something special, but it's really nice when it happens.