Hataraku Saibou / Cells at Work! - This is why you don't lewd platelets

It takes about a minute for a blood cell to complete one round trip around the body, and in the episode about circulation seems to imply the entire process took all day. So it can be deduced that 1min our time = 1 day cell time. There are 11520 minutes in 8 days, so that means the Platelets can live to be 30 in cell years.

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