A detour is limited to no more than 5 hours! Getting milk can lead to a detour, but you are expected back home within the 5 hour limit. Anything longer than 5 hours is a planned mission. Rule #47 (Missions)
Created by: MeDDish - level 15
But if you take 3 hours to get the milk, take a break at a local farm and spend another 3 hours delivering the said milk back to your base of operations, is it a mission or two detours?
No limits on time, anyone can Ingress as much as they want to. If I don't come back home in 3 days cause I got a huge detour, so be it.