I have a powershell script which does most of the command line and scheduled task work for you. It it commented to self-explain what it does mostly.

Filename: set-logoff-time.ps1

• View in GitHub
• RAW PS1 file / download

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Otherwise use the guide below / copy and paste the command line examples given, again change username/time to suit your requirements.

How-To

Open the commaand prompt as Administrator, powershell can work but may not recognize multi-string days using ";".

Replace username "kids" with whatever username is desired.

Day format is, Su, M, T, W, Th, F, Sa

uses 12 hour clock, not 24 hour clock.

EXAMPLES

To add all days of the Week and allow only login between 10am to 10pm.

net user kids /time:M-Su,10am-10pm

To remove any logon hours

net user kids /time:ALL

To restrict ALL logon hours (none allowed)

net user kids /time:

Multiple days string with limits (or use just single days if wanted)

net user kids /time:Sa-Su,8am-9pm;M-F,4pm-9pm

Force logoff when time is up

Scheduled task, set a time. Action: Program, "shutdown", Parameters/Arguments: "/l /f" (no quote marks).