How long does it take to make the rock?
How long for the mount? Maybe the same amount of time???

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That rock took about 4 hrs start to finish. There are a bunch of different steps involved and drying times for some of them.
The cougar takes quite awhile longer. You have multiple test fits and altering the form. Rarely does a lifesize hide fit a form on the first try. Some can be altered on the first try and others take days of test fitting and altering. Then you have the sewing which on a cougar can take at least one whole day. Very satisfying when you are all done though.