panda_sweetgurl Free SS or coins obtained such as from login and rewards all expire in 30 days from receiving. You can check the expiration of each group of SS/coins in your account, but it’s easier to go off the number of stones that will expire in 3 days as it states on that notification. As long as you consume that many SS/coins within the 3 days timeframe, you won’t lose any. But note that this notification is daily, so the amount may fluctuate from each day, in which case, this is be new number you need to consume.