I ski in the East 4 or more times a week. The most I'd go without at least checking the skis out is 2 days, if it's icy I will do a minor tune every day as the edges get dinged up. I'll usually wax every 2 days, sometimes 3. Details follow:
My routine is to lightly debur the side edges with diamond stones every day or two of skiing, if there is a real ding on an edge I'll use a coarse stone first, otherwise just medium and fine.
Every couple of weeks if needed I will file the side edges followed by successively finer stones.
When I ski in Colorado for two weeks, most of this is unnecessary, just a light stoning once in a while, but the soft snow does not rough up the edges like Eastern hardpack does.
As to wax I like to keep the bases from drying out so at lot of it is visual, I can see when they need wax (as far as protecting the bases is concerned.) If I want to be fast that day, or have a lot of cat tracks to ski on I'll wax for speed. I've used many different methods over the years (drip on and iron hot wax, paste wax, rub on and iron hot wax, liquid. Rays Wax Wizard is a tool I use often.)
Ptex filling for dings, light SkiVisions base stoning and other things happen when needed.