I give them two months. I figure that's enough time to account for vacations, life-events, and whatnot before it's clear they're no longer interested. That being said, I have room after a recent purge so feel free to add me if you'd like!
3 seconds. And then it's outta there!
I have one neighbor who has not played in 34 weeks. But I keep her on becuase it's LeT's town and it's been described as the Rosetta Stone of tapped out. So it's of value to me.
Did any of her other neighbors keep her too?
If you already have all the friendship prizes, does it really matter if your neighbors are active or not? The most recent events, there was no benefit if you were visited by neighbors. If your neighbors are inactive, you could still visit them for your 3 taps and get event currency.
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