From MothCraft

Allows VIPs and Donators to buy from the market and place a block [end_portal_frame] down and right-click it to access a menu which allows the donator or VIP to upgrade or add more time to keep a chunk loaded for farms and other things that you'd want to leave still running while you log out. for 25,000 mothbux and comes with 3 hours loaded on it already.