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/

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/platelet-donation 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.