Countertop Depth

Was wondering if there is a standard depth in your countertops used in your builds?
Just checking since I bought nice wood countertop and I have to have some cutting done..
Also our tear is 5 foot wide with 3/4 inch Ply for the walls so what kind of a gap should be left there at the countertop ends so it wont be real tight and have room for a lil movement ?
I can seal the ends with an elastic silicone or? decor moulding.
Classic Finn
Just checking since I bought nice wood countertop and I have to have some cutting done..
Also our tear is 5 foot wide with 3/4 inch Ply for the walls so what kind of a gap should be left there at the countertop ends so it wont be real tight and have room for a lil movement ?
I can seal the ends with an elastic silicone or? decor moulding.
Classic Finn