An hour is plenty enough time for just sex and some chit chat, but 2 hours for me, is the bare min. for a GFE. I can't do GFE in an hour...that's more of a PSE for me. If you don't want to be rushed, don't book just an hour. Most women will quote you a 90 min. rate even if it's not listed on their websites, so you can also try that. You'll have to ask the provider in question about an outfit. Generally you guys are clueless about sizes and what will look good on a woman.

Like London said. Also depends on your endurance and budget

You know your own physical capabilites and what you want out of a session. Also, how much are you willing to spend? You might not want to pay for a 2 hr session and then chat for ~ an hour or just leave early. Some guys can get in a good GFE session in 1 hour. However, 90 minutes for others is a better option if available, and less expensive than full 2 hours. There is no reason to rush through a GFE session just enjoy moment by moment

For me, two hours is better than one because I like a happy ending which requires the story be longer than one hour, particularly when you consider every story is preceded by the forward by the author.