In Texas if you get a letter of foreclosure on your home how long do you have until you have to vacate?

My uncle received a letter that his home will be foreclosed on Feb. 3, 2009, I heard that by law you have either 30 or 60 days after the foreclosure date to finish moving out or completely vacate the home. Is that true? He lives in Texas (I wasn't sure if the foreclosure laws varied from state to state) Thanks in advance for any help!!