logon hours for specific computers

Hi,

My scenario:

I have 2 security groups.

1 has 300+ users

1 has 10 classroom computer accounts

I want those user to only be able to logon to the 10 classroom PCs at specific hours 8 to 5pm, while keeping them unrestricted on any other PC (Computer labs, etc.)

Is this doable in a domain environment through GPO? I cant find how? If not is there any other way?

Thanks