How to start / stop Dropbox at a specific time

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http://askubuntu.com – I have setup a service on my Ubuntu 10.04.4 LTS server, which works when started and stopped manually using sudo service <service> start etc. However I would like to have the service (dropbox btw.) only running for a few hours each day, as the service uses a lot of memory. I have added the following to my cron using crontab -e, but it doesn't work as expected: 1 5 * * * /etc/init.d/dropbox start 1 6 * * * /etc/init.d/dropbox stop This returns the following message start-stop-daemon: not found. Am I doing it wrong and if so how do you start / stop a service at a specific time? (HowTos)