Is there anyway to limit the number of users?

Very straightforward, is there anyway to limit the number of users of the Airport Express for only a certain amount of time during the day?
There are certain periods during the day that I don't want my cousin to use the wifi, but the only way I can think of is to change the password and only type in the password for him when he needs it, however this is very troublesome? Is there a more sufficient way to do this?
Thank you.

You have the ability using Timed Access to establish daily time limits (or no time limits) for each computer that will be connecting to the AirPort Express.
Open Macintosh HD > Applications > Utilities > AirPort Utility
Click Manual Setup
Click the Access Control tab located under the row of icons
For MAC Access Control select Timed Access
For complete instructions, click the Help menu at the top of the screen and then click AirPort Utility Help. Enter the following phrase into the search box:
controlling access to your wireless network

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<P>
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Is there anyway to limit the number of users?

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