I've run the 10k three years in a row and will be doing it again this year. I'm around 55 mins for a 10k and I wouldn't want to be out there much longer than that. It gets hot. It's a great event. The pasta party the night before is a good time and so is the festival at the finish.
It really is wonderful hitting the finish, grabbing a coconut, a redstripe and heading straight to the sea.