Received a painless upgrade to Hilton Diamond. According to the AMEX Centurion website, Hilton has a challenge that expires Dec 31 this year. Stay twice and get Diamond. Anyone know if this is appropriate for me in order to EXTEND the status? We have a stay in June at the Conrad Algarve (soon to open) and might it be worth it to get a somewhat better upgrade if I can find two cheap nights locally? It's nice to have status even tho this is one I hardly ever use. But if I can do this for under $200, might be a good idea - tho open to dissenting views! Many thanks.