Not sure how long your "Holidays" last, but...let's talk about "ski-days" for clarity.
I assume you mean both wax and edge tune service. Answer: It depends. On soft non-abrasive snow 5-6 days maybe (unless you heve edge burrs that need repair). Hard/abrasive snow, 2-3 days, generally.
And just get a wax unless your edges need service - save as much edge as you can. Also, no need for stone grinding the base more than once, maybe twice a year (unless dammaged).