If you've been working for a while, you will probably get 6 months of benefits from the state. Then the tiers kick in, with extended benefits that are funded by the federal government. The tiers depend on the unemployment rate for the state. I've been unemployed for 14 months now, and am in Tier 2 (now that we didn't go over a fiscal cliff on Jan. 1).
All the info you'll ever want to know is found on the unemployment forum, here:
Be sure to read the "sticky" FAQ thread at the top and also search the forum.