If you're referring to the screen time-out setting, see if this helps:
Adjust Display Settings - LG K8 V | Verizon Wireless
If you're talking about something else, please post back.
And in case you need it:
https://ss7.vzw.com/is/content/VerizonWireless/Devices/LG/UserGuides/LG_K8_V/lg-k8-v-ug-060816.pdf
