Thanks, but that's not actually definitive. Somewhere on Reddit is a list of information about time turners, and while this was quoted there, nothing else suggested that you couldn't go back 6 hours, wait 12 hours, then go back 6 hours with a new time turner.
But there was a clear statement by Eliezer that you couldn't go back 6 hours, wait only 6 hours, and then go back again. This imposes a hard limit of 48 hours per day.
Nope, you're right. It's not definitive. In my original comment, I just said I thought I remembered reading somewhere that you couldn't fit >30 hrs into a day, and the passage I quoted is where I got that impression. If /r/hpmor thinks it's possible that TTs let you fit up to 48 hrs in a day, then I have high confidence there wasn't anything explicitly forbidding it in the story.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 116.
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)