someone counted up all the "ticks" that happened and gave the assumption of one minute/tick. I assign way more confidence to the second assumption than to the exact number of ticks, as I didn't count them up myself.
I certainly didn't get the impression reading the chapter that each tick indicated a minute of time. I'd be more inclined to associate each tick with the second hand moving forward, and only really expressed when Harry reached a break between his disjointed thoughts.
Additionally, Eliezer had posted the following on Facebook:
The cognitive skill taught in Ch. 88 is the insight that I call 'wasted motion'. If you read Ch. 88 closely, a 'Tick' does not occur just because time passes. It occurs after each of Harry's thoughts (or actions) that predictably do not contribute to [resolving the issue successfully].
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 94. The previous thread has passed 200 comments.
There is now 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.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: