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I don't have Verhoeven's pdf, I have his book. From what I recall most of the changes caused by tempering occur within two hours so you will do just fine with two one hour cycles. I remember no mention in the book that the cycles should be of different temperatures. This came up on one of the other boards not too long ago and Kevin Cashin chimed in and said that for most steels a single two hour cycle would do too. His opinion was that this three two hour cycles was part of the idea that the more the better.
Doug
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