RIP Ozzy Osborne
(www.rt.com)
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He'd have to be there constantly.
Your own red blood cells only live 90-120 days.
The donor ones have a significantly lower shelf life, closer to a month.
Well everyone roughly has about 5 liters of blood and you can lose up to 1 a day and not pass out. Give him a week and all the blood should be replaced (in theory). So not entirely IMPOSSIBLE but most definitely extremely expensive.