Hearhstone Heritage Soap Stone Stove Burn Time?

I have one. Expect 5 hours burn fully loaded with coals up to 7 hours later to restart with. I tend to put a chunk in every 1 - 2 hours during burning depending on the size of pieces i'm burning. I'm happy with it for my application. A Mansfield would be good for overnight burns, but I usually have some coals and use the little ash drawer to restart using bark or kindling on just a few coals.