A few tips as I'm doing the PLT challenge now.
1. Dont make the same mistake I did thinking that the email from the CSR telling you about the challenge is actually signing up for the challenge. I had about 3 stays thinking it was towards the challenge and sure enough it wasnt because in the 3rd or 4th paragraph from the CSR it says "Please reply and confirm you want to do this" (who reads all this stuff anyways!?!?)
2. I was given PLT status during the challenge YMMV
3. Sign up at the first of the month. They dont give you a standard amount of days to complete (who knows why not) but instead it's your current month and the following 2 calendar months. I signed up on the 18th meaning I wasted 18 days of being able to count towards the challenge. I called CSR back asking them about it b/c I didnt want those 2 weeks of a stay here and there to be the difference b/t me getting it and not she said not to worry about it and if I missed it by 1 or 2 they can "work with me"
All that to say just sign up as early as possible in the month.
Thats all for now....btw take advantage of the room upgrades during the challenge...I'm not sure I've NOT been upgraded yet during my stays (most at CY's and one at a M)