How do I evaluate a class not on every puppet run?

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http://serverfault.com – I would like to have a method that only evaluates a particular class once a day at a specific time. Right now I am running my puppet agent from the cron, but I would like to change it to either run as a daemon, or run more frequently. The barrier with increasing the frequency is that there is one class that takes about 4 minutes to process, and doesn't need to happen very often. I am trying to find some method to only evaluate that particular class once a day from cron. Is there a simple method for me to set an environment variable (FOO=bar;puppet agent ..), or add a command line option ( (HowTos)