Long soak heat treatment of saphires

Does anyone has information’s on Long soak heat treatment of blue sapphires, heating the stone under 1000C for 40 days ?

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I did a test a while ago, heated a ugly green/yellow silky sapphire from Australia for 15 minutes @ max 900 degrees C [ under a gas blow torch], & it changed colour to blue but still with silk, will test further

No information about long soaking but YouTube has some pretty good info. on basic heating. If you lookup how they do it in various countries they basically burry them in sand or dung and heat very gradually and cool over quite a long period to get some amazing gems out of fairly simple process. But no guarantees that they all come out equal. Seems like they get what they get. Montana sapphires seem to be a little easier to calculate but…