Donating blood 11 days before a marathon

I've donated over 60 pints over the years, but not so often recently as donor clinics aways seem to clash with training.

There's a donor clinic at work coming up but this is 11 days before my next marathon. I'll be tapering then so can work teh easy runs around it and have a few days off afterwards, but will it have any effect on my marathon ?

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