I wonder whether the Tootsie Pop reference was a Leaning on the Fourth Wall hint to the readers or if we're meant to take that as Hermione subconsciously remembering what was going on? ("One hundred and eighty-seven. I tried it once." is kind of chilling, in that context.)

Or it could've been just a meaningless flippant remark, that too.

And 12 minutes per cycle? For the script given in the chapter, I'd peg it at more like 2 to 4.

Edit: Actually, I just though of a way to get an upper bound - the amount of adrenaline the human body can produce in 2-4 minutes is probably pretty sharply limited, right? Mr H&C presumably had to startle Hermione at the end of every cycle, so the physiological reaction would match up to the initial surprise and smooth over any discrepancies. I find it hard to imagine that "a rush of shock and fear hit her like a Stunning Hex over her whole body" more than five or so times without just leaving her burned out completely. (Not that she didn't seem pretty burned out by the end.)

And she can't be dead. For she is the bearer of a most marvelous destiny-