Jim,
I said 'fast as it can' but that really isn't all that fast, probably takes about 30 minutes.
Irish,
Bad steel is possible but I can't say that's the problem. There are lots of different manufacturers for O1 and the steel they make is not all the same though. How is the blade set in the oven? Flat on the floor would be a problem but I doubt you're doing that. Trying to do more than one blade at a time will make a blade sit too close to a heating coil on one side, that could be an issue...
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