We used the quick stick write on safety tats (vs the original which last 1-3 days). That kind works up to two weeks. What we like about the write on ones, is depending on who my daughter is with we can change the information we want on there (each time we put a tattoo on). Also we used them when we were on a cruise so we were able to write which ship she was on. I want to say that the longest we have had them on our daughter is about 9 days. By that point the edges were getting a little frayed but the whole thing stayed on without issue.