tmk_ing Free SS last 1 Month, bought ones are permeanant. In the SS tab it tells you how long until they expire. It uses your oldest ones first. IE: if you got ~10 from login, ~10 from voting, ~10 from ad on the ap daily, you could carry 900 at most before they start disappearing due to 30 days. Without the app that's about 600. Less if they ditch SS on daily logins, which sucks.