It will go dormant and slowly die off, but you could easily use it for up to 6 months.
Welcome to the forum! Your post is a great question that does pop up here every now and then. Go to the main HomeBrewTalk page, then click on Homebrewing Beer. You'll see a Fermentation & Yeast subforum. Thats a great place to look around for yeast info. Don't forget to skim the "sticky" posts at the top of that subforum.
BTW, that is really where your post should have been posted. A moderator might move it there to keep things tidy. This subforum is really for... Announcements & Feedback