I don't personally know anyone who has the patience to sit through a slideshow.
That depends. If we are talking about two hours of someone's slides of their kid's fifth birthday, then yes, I don't know anyone who has the patience to sit through a slide show. I believe that slide shows should be kept relatively short, and kept interesting. Too many shots of basically the same thing and out-of-focus or poorly framed shots are a sure way to put people to sleep (as are just too many shots, period).