Carnival Miracle St Thomas Excursion Time??

[Duffys wife 1957]

A friend of mine is scheduled to leave on Miracle 9/30/08. The St Thomas excursion he is interested in taking is Coral World and Magens Bay Beach. The time is 12:30-4:30 for 4 hours. The ship is scheduled to leave at 4:00. Do they cut the excursion short? Or do they leave earlier? He doesn't want to to pay the $$ if it isn't at least 4 hours. Has any one ever come across this scheduling time difference? I was thinking of posting this on the St Thomas board also to see if anyone there is familiar with this scheduling conflict..Thanking you in advance;)

[Dedivah]

I don't understand why they would have that time schedule when the boat is scheduled to leave 1/2 hour earlier than the excursion ends. I believe that the tour guide will leave in plenty of time to get them to the boat beforehand. They also have to take traffic into consideration. If the ship is in on a week day there will be traffic. I would definitely inquire about that excursion before purchasing.