For me, the green boxes stay until some building offers new coins to collect. I usually build something every day, at least a couple of level 6 buildings, so something is always in day 1 HMP to make green boxes disappear quickly.
For me, the green boxes stay until some building offers new coins to collect. I usually build something every day, at least a couple of level 6 buildings, so something is always in day 1 HMP to make green boxes disappear quickly.