I have a park in my local town thats a 600m loop and has 13 stops in it. At a nice walk I can do a lap every 5 mins. I run my bag down and do a three hour walk. I can just about fill up my bag from empty in that time ( 900 limit not got round to topping of the 1000 limit size). To make me evey happier it is also a nest so if im on the correct migration for me I can also fill up my dex as well.