OP
diverintheflesh
Contributor
I think it depends on what skills you are referring to? All skills like breathing without a mask or navigation will diminish over time if they are not practiced no matter how many dives you make. Mrs Flush and I decide in our dive planning what skill if any we are going to practice during/at the end of the dive.
In general terms I would think getting 12 dives in a year would keep your skills relatively fresh but that is all predicated on when those dives happen, how they are spaced, and if skills are practiced.
Thank you for your contribution.