What is the correct amount of time to give for RSVP?

I am sending my invitations the first week of November for a February 4 wedding. (done specifically to avoid a clash between Christmas cards/Christmas season)

I was going to requet a reply by January 11, 2012. (I need to give the hall a final number by the January 31)

Is this ok? Should I give people longer? My family has a habit of not sending replies on time so I wanted to have more than two weeks to call those who don't reply.
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