Sprites use stardust as materials for creating objects and items, and to re-build their homes. When the star sprite appears after the mining process, players may talk to it to exchange the stardust for the rewards. However, it is recommended that up to 200 stardust is collected before exchanging, as this is the limit for the rewards granted per day. Star sprites disappear ten minutes after the star has been completely mined. A day is defined as the 24 hour period beginning at 00:00 (UTC).