HAHA! yeah, I've emailed Genuine Innovations and am waiting on their reply.
It might not matter... You should always check the pressure after fixing a flat. 12-24 hours is sufficient to find a slow leak.
Put a little soap water on the plug site and you'll see if air is leaking from it. if not, well, you know your Co2 slipped away...
They do sell a N2 canister...
thats supposed to do away with the problem of losing air.