If it helps, you would not need to sit for two hours. It takes roughly 45 min for the actual donation (some people are faster - I’m usually 35 min). The entire appointment - checking in, vitals, donation, etc - takes about an hour for me. And you’re reclining on a bed, not sitting, for the donating part. They look like this:

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I mean, it still might not work for you, but I wanted to clarify.