Will running my truck's radio with the engine off kill my battery?

I'm going out to the beach and would like to have my truck's radio playing. I've got a 2003 Ford F-150. The radio is stock, with no after-market speakers or subs. I just want to know is if I run the radio for a couple hrs will it completely drain my battery? It would suck to have a great time out on the... show more I'm going out to the beach and would like to have my truck's radio playing. I've got a 2003 Ford F-150. The radio is stock, with no after-market speakers or subs. I just want to know is if I run the radio for a couple hrs will it completely drain my battery? It would suck to have a great time out on the beach and then when it's time to leave, the truck not want to start. I appreciate any and all information.
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