I don't know exactly how long the safari takes. I know it's fun, though. I'm going to put this post back on page one for you, so that one of our veterans can answer your question. I have no doubt that there is a DISer who knows the answer
We were at AK a couple of weeks ago and the park was open at that time at 9:00AM and closing at 5PM. The safari ride was about 20 minutes and really nice to go on.