Samsung SP-L220 - Manual (Page 30)

Sleep Timer If there is no input signal for the specified time, the projector is turned off automatically.
(But, for the specified time, there must be no button input from the remote control or the top
of the projector)
1) Off
2) 10 min
3) 20 min
4) 30 min
Information You can check external source signals, picture setup, PC picture adjustment and lamp use
time.