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by akuchling 5315 days ago
It's not as bad as it sounds, though 6 hours is quite a while. Platelet donation is done this way (http://www.redcrossblood.org/donating-blood/types-donations/...), taking an hour or two each time, and there are donors who make a platelet donation every two weeks. The blood cools while it's being run through the machine so you get chilly, but donors generally just sit under a blanket and read or watch a DVD for the duration.