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Working Out: How Long to Wait. If you have a workout routine that is scheduled for a few times a week, try to wait at least 48 hours after getting your tattoo before you work out. However, if you are in training or cannot function without a daily workout, you can cut the time to 24 hours.
1 Only a few states currently regulate tattoo facilities, so most donors with tattoos must wait 12 months after tattoo application before donating blood. 2  You should discuss your particular situation with the health historian at the time of donation.(American Red Cross website).hen you go to a blood bank to give plasma, they ask you a series of questions to determine if you are eligible to donate.