Thanks for the replies.
Jumpgate, could you give a ballpark percentage you got reduced? It's probably not going to be directly comparable across properties but just for my rough idea.
craz, are you aware of some SPG-wide policy that might prevent a stay exceeding 30 nights from being accruable?
DC777Fan, thing is I've still got some nights left to renewing my Plat status this year, and if staying at a SPG property over 3 months at a _reduced_ rate won't get me any nights counting towards it then I probably wouldn't bother.