Originally Posted by
TerryK
Yes, but the OP mentioned two nights. The suite upgrade certs on revenue stays are valid for up to seven nights. Or is it only seven nights for Diamonds and two nights for Platinums?

Yes, but those two nights that the OP mentioned are
not revenue nights! The point is that the suite upgrade certificates are only good on paid revenue nights -- regardless of status!
Otherwise, I believe that you are correct in assuming that the 'suite upgrade' certificates are the valid for up to 7 nts if on a revenue stay (ie. it's the same benefit that diamonds have)!