u/PaleontologistNo6758

I recently found out there was a Pokemon vending machine near me only 1 week before I move in for college. I happened to catch a restock but it took a while for the machine to show any stock. I checked 2 hours afterward and it still said “performing maintenance.” I ended up coming back later that day with my friend around 4:00pm and we were able to get 2 packs each. I’ve since came to check the stock a few times each day but they don’t have stuff half the time. I was able to get an ascended bundle yesterday (which had 1 ex out of all 6 packs). Does anyone know when the stock actually changes? Is it truly random or is there a set time every 30-60mins at which it displays more items? If it helps, this is at the ACME in Freehold, NJ.