how long (how many hours) to replace both heads gaskets on 1999 Chevrolet 1500 Pickup

a friend wants me to replace heads gaskets on his P-U how many hours, is a fair price

Ps no pro bono

Asked by for the 1999 Chevrolet 1500 Pickup
The book time is around 12 hours for the replacement of both head gaskets. For a friend, I'd say 15! :)
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