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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.
In the United States, you must wait 12 months after getting a tattoo or body piercing before donating blood if your state does not regulate tattoo facilities. This is because bloodborne diseases may be spread by needles, and no one has come up with a good way to vet the tattoo and piercing parlors as not re-using needles.