I believe the rolling tier is good for Requalifying and not for initial qualifying.
When I spoke to the Plat desk on behalf of a friend who is based Overseas they told me (thinking I was him) that since I (he) didnt have any Stays at all last Dec '06 or Jan '07 that in order to requalify I (he) would need to get all 75 done by 1/1.
This was late Nov, last week they told me that they alreay went ahead and renewed my (his) Plat status which he has had for 10+ yrs, even though he was still short by a couple of nights.
So is MR doing like HH and will they look at any 12 month period of activity, each month?