5hrs 40 in a glider (bloody freezing). I know, a mere beginner. Shortest flights would have to be the inumerable cable breaks one endures as a silent flyer.
Powered I battled a headwind and took three hours to get to Oban once. I'm sure I was going backwards some of the time, it would have been quicker to walk.
Western Australia to Koggala, Ceylon
My mate's dad flew Sunderlands out of Koggala, I think you're probably the only other person that's heard of it!