Depends on if you're driving afterwards... in which case, less than the legal allowable limit.

Other than that, it depends on the type of company... is this a normal thing? Is the boss paying? Is it to celebrate something or just to get let off some steam or to just get out?

if all else fails. go with your gut... have only a couple and see how it goes... then wait to see how it goes in the office the next day... that should then drive any future actions...

-tg