"When boiling lobster, how do you tell when it's done? Is there a rough estimate of cooking time (eg: time/ounce, etc...)?
In my comment, I referred to the CookingIssues write-up on Giant Lobsters. The site went down, so it was impossible to get the 'conclusions'. The site is back up again, in a way, so here it is:
Note that only the whole lobster weight is given and that the body was cooked together with the shell.