Denon AVR-X1700H 7.2-Channel Network A/V Receiver with HEOS - Manual (Page 131)

Sleep timer function
.
ZONE2 SLEEP
MAIN
You can have the power automatically switched to standby once a set time
has elapsed. This is convenient for viewing and listening while going to
sleep. The sleep timer function can be set for each zone.
Contents Connections Playback Settings Tips Appendix
131
Front panel Display Rear panel Remote Index