I'm a very strong believer in getting stands setup in a bunch of spots that I know going in I likely won't hunt. I want them there, though, "just in case" I get intel on a buck in that area and DON'T believe I can kill him from one of the lower impact stands.
On public lands it's a different animal. I have 1 or 2 spots I believe I'm going to kill from and don't setup any more. That said, I ALWAYS find the buck I want to kill on public grounds before I setup, and they really zone in on those areas they feel safe, showing a very high degree of affinity for them. So, it's a 1-2 stands in place, wait for the right conditions, go in and get it done in a sit or two (or fail dismally) scenario.
On managed grounds, I just don't think you can have too many stand options, ASSUMING you can show the discipline not to hunt most of them. to put it in context, between hanging new stands and prepping existing ones, I've done between 100-200 stands a year for quite a while now. At least 75% don't get hunted each season by me or my long term management clients or their hunter buddies/family, maybe as much as 85%, but never anything close to 50% of the stands I prep each year get hunted.
Now, I completely understand that I am not "normal" in a laundry list of ways. It's also a game changer when you get "free" stands each year you want/need them for pro staffing for various companies. I've bought some blinds, but I haven't bough a treestand in somewhere over 25 years now. I get this being my "job" and getting the supplies I need for "free" are big time game changers and put me in a very advantageous position.
That said, there are huge advantages to having a bunch more stands up than you'll ever allow yourself to hunt. It's been many, many, many years since I've hung a stand within deer cover anywhere close to season. So, when cams, observation or sign is telling me that I need to go in after Mr. Big, I always have a stand already prepped mid summer set and ready to roll. All I or the clients have to do is slip in and hunt it. Merely slipping in and hunting is a HUGE advantage over going in during season, scouting, prepping a stand then hunting it. Sure, what I do is a lot more work, but I think it's way more than a fair trade....The catch is that you have to show disciple and not hunt those locations unless you have tangible intel telling you that you have to go in after him in order to get the kill (well, that and for most it's a serious investment in stands and free time getting them all up and then loosened each year).
Field edge stands are a completely different animal in my eyes. So long as I cut odors as if I were going hunting, wait for late morning to go in and keep my disturbances to a minimum, I have no issue hanging those types of stands during season and hunting them immediately, without worrying about boggering things up.
back to the original ?, Willy's drawing is a very good example of how much of a property I typically hunt each year. I want the option of going in after them, but probably 3 out of every 4 years on average, I don't need to hunt any more of the ground than that. I've consistently found that training deer that they are safe on your ground and to move more freely on that ground during daylight is every bit as big or even a bigger advantage than having stands already set and ready in every good-great location on a property, "just in case" they're needed.