We went as a family in November and got all but 1 (of 6) approval letter back in about 24-36 hours. One was denied because the form didn't specifically say where the test was given and what type of test it was. We resubmitted and all was good. One of the 6 submitted was a positive antibody test and we didn't have any issues with that. I went on my own in February and had to get my test exactly 5 days out due to my work schedule. I then had flight issues and missed my connection in Ft. Lauderdale and had to wait until the next day for the next flight to St. Thomas. I called the tourism board and told them of the situation and they said not to worry about it. When I arrived they didn't even look at the date on my paper or on the approval letter.