It goes without saying that nobody could walk 265 miles in a day. Even Les Stroud could probably walk 30? miles in a day, probably at 3mph, so at 10 hours per day it would still take him ~9 days. At 2mph it would take him 13.25 days.
Point is, the current twinkies required (107 twinkies) to walk 265 miles doesn't take into consideration the amount a person would have to eat in a day to sustain his body weight (~2000 kcal a day).
* To sustain your weight: 15 twinkies per day. 9 day trip: 135 extra twinkies. 13.25 day trip: ~199 extra twinkies.
* Nor does it take into consideration the weight of backpack you would need to carry be able to walk that far. (25-40 lbs) (not sure, but may be 120 extra kcalories burned per hour)
With a weighted pack, that may be an additional 1200 kcal per day or 9 more twinkies for each extra day.
In short...
* Walking for 9 days at 3mph (10 hours per day, 30 miles per day) with a weighted pack [total of 265 miles]: 107 + 135 + 81 = 323 total twinkies
* Walking for 13.25 days at 2mph (10 hours per day, 20 miles per day) with a weighted pack [total of 265 miles]: 107 + 199 + 81 = 387 total twinkies
* Cost of search + rescue team that has to find you in the middle of the woods after you collapse from hyperglycemic shock: priceless.
I cannot vouch for the accuracy of any of these numbers. Do not attempt, lol.