Any way to set duration before EX4 goes to sleep/standby?

My Cloud OS 3 Personal & Network Attached Storage My Cloud
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I can turn my Sleep Mode On/Off but I can’t find a way to set the duration of inactivity before it goes to sleep … I’d like to set it ti 15-30 mins of inactivity before entering into sleep mode.

Cheers, Rob.

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@robains

https://community.wd.com/c/network-attached-storage/wd-my-cloud-ex4