Packages offering parental controls will usually have some options to set time limits on internet access (although these can often be specific times instead of a length of time). It's worth looking at the students anti-virus, router and internet provider as often there are parental options included. Otherwise this article might point you towards some free tools
From: A discussion list for Assistive Technology professionals. [mailto:[log in to unmask]] On Behalf Of Ben Watson
Sent: 16 May 2013 12:52
To: [log in to unmask]
Subject: Software to limit time online
Does anyone know of any software that can be used to limit access to the internet (to a set number of hours a day) for students who have difficulty controlling their time online?
University of Kent
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Version: 2013.0.3336 / Virus Database: 3162/6327 - Release Date: 05/15/13