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This is just my opinion, I am sure other will have theirs and will post them shortly.
But I think it will be fine. It does have a larger proportion of cement than normal. But if you are only going to fire it once or twice a week, my guess is it will last a long time. The heat does cause the cement to deteriorate, but you have a good amount of fire clay in the mix.
Of course I am just going off of what I have read.