You should allot them a 4 hour, 45 minute slot for golf. There is a general "pace of play" that most people follow in terms of golf etiquette, but as we all know Disney doesn't always enforce the rules on their property. That said, if they can get an earlier tee time, it'll likely be played at a quicker pace. As the day progresses and more people are on the course, there's more likelihood that the pace of play slows down. As an example, we've had the first tee time of the day and been off the course in under 4 hours -- sometimes as quick as 3.5 hours.
I appreciate the advice! Since I'm not a golfer, I don't completely understand the flow of the course. I'm hoping for the shorter time, but I don't want them to feel rushed or be watching the time instead of enjoying the game!
A 10:30am start MAY be cutting it a little close seeing as you'll have to calculate in what will likely be a 20 minute drive from the Palm to AKL.