The last pound is like that boor who is always the last to leave the party you threw--the one who doesn't notice when you stretch and yawn and look at your watch, the one who doesn't budge when you start cleaning up the wine glasses, the one who bores you to tears with the same stupid anecdote you didn't think was funny the last two times he told it.
Unfortunately, there's nothing you can do to speed him on his way aside from continuing to clock-watch and clean in hopes that he'll take a hint. Eventually he'll shuffle off and you'll slam the door and think, "WHEW! I won't see that ****** again until the next party I throw!"
I hope your unwanted guest leaves sooner rather than later.