If you select 12 specific numbers in advance before the spinning begins, you will never see them missing for 37 spins. When you say 1st dozen, in fact you preselect 12 numbers. It is numbers 1-12.
It is the same thing as if you preselected 2,9,10,32,23,0,33,19,36,14,27,11.
Spinning the wheel 37 times I guarantee you, you will see at least one of those number before 20 spins. Most likely within 10 spins.
It is not the same as recording 37 spins and then go back and collect all the sleeping numbers.
That should answer your first question.