Well the most I’ve ever had at once is maybe 175000, but I spent them all. I’m fact I spent them all today starting at 88000 and now have a whopping 280 nook miles
300,000. I really don't need them atm so they just sit and accumulate. I haven't played much recently so it's kinda been sitting there at that number for awhile.
I used to have a lot more on my main island. I haven’t really played that island in awhile but I think it’s around 50k as I used a good amount of nook miles before I took a break. I think the most I had at one time was 250k.
My second island I restarted on New Year’s Day so it doesn’t have a lot either .
I recently got terraforming so most of my miles went to that . Right now she has 30,000.
I currently have 1,162,270 Nook Miles! I really haven't spent a lot of them over my course of playing the game, and mainly had to grind them out in order to get all the Nook Miles achievements, lol.
I have 368k on my main file and about 25k on my other file/island resident. I'm shocked to see people with 1 mil though omg,,, could never be me I fear, but I admire the dedication.