The Windows 8 and Windows 10 Lockscreen times out after just 1 minute and the screens go black

Solution 1:

You can add the dword registry value Attributes under

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\7516b95f-f776-4464-8c53-06167f40cc99\8EC4B3A5-6868-48c2-BE75-4F3044BE88A7]

and set it to 2 to add Console Lock Display Timeout to Advanced Power Options under display. Now all you have to do is go to Advanced Power Options and change the setting. I set mine to 0 so it never times out.

Source: This tutorial.

Solution 2:

The settings for the Lock screen timer were there all along in a familiar place. If you Right click on your desktop-> Personalize-> Screen Saver Box where it says "Wait" signifying how long until a screensaver comes on. I use screensaver "NONE".

When screensaver is set to NONE, the Wait time is when the Lock screen comes on. By default it is 1 minute. I set it to 2 minutes and started a stop watch. 2 minutes later the lock screen came on. Then I tried 5 minutes. 5 minutes later, Lock screen.

I don't know how it will work with a screensaver... but there you go without one. I have the habit of just turning off my monitor so I don't need one really.