How long does it take to change a cylinder head gasket on a BMW 535i?

I have a 1989 BMW 535i auto and someone changed a cylinder head gasket for me - twice!! The second time the head was skimmed . I paid for all the bits and he did it in a small garage but I feel I am being ripped off. So how long would it take and / or how much would it cost. It still produces ' emulsion ' from the radiator ( how do I get rid of that ? ) and steam is coming out of the exhaust - so it aint fixedHow long does it take to change a cylinder head gasket on a BMW 535i?tear it down clean up and replace bout 6 hourssounda likr u got

cracked head or blockHow long does it take to change a cylinder head gasket on a BMW 535i?it should take about 2 to 4 hours to do it.

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