The SAFE netowrk does not know time. So this cannot be done.
Also its is rude at best to take coins that someone is “saving” up for a big purchase in time. Like buying a house or something. Then find their coins are disappearing because they were saving them. And at worse it is considered thief. No no and no again to this idea.
@whiteoutmashups, I’d say like BTC which has a significant amount of their coins lost or unusable is surviving very well. SAFEcoin has 4 billion coins and even if 20% are lost the network will operate as if they were not lost. Only if billions of coins are lost is this an issue.