I agree with Andy. You should give it try and take notes about it for future reference.....Near as I can tell, water boils at around 201 degrees at 6,000 ft. The cooking time would need to a little longer, but 90 minutes does seem to be a very long time.
I used to be a racist, but I don't have much interest in it since Dale Earnhardt got killed.
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Good judgement comes from experience; experience comes from bad judgement.