I have recently signed-up for the Starwood Preferred Guest (SPG) Platinum Elite Status Challenge which requires me to do 18 eligible nights over a span of 90 days. With the upcoming loyalty program merger which is supposed to happen in August 2018, I wanted to obtain Platinum Elite status since hitting 50 nights might be a little bit of a challenge for me (since I barely travel for work). If you have not done it and would like to qualify on stays instead, Marriott Rewards is offering the opportunity to do 9 stays in 90 days and this will port over to Platinum Premier Elite (instead of a lower-tier Platinum Elite with SPG) in August if your challenge is completed successfully.
I checked out of the Element Kuala Lumpur (and took advantage of the bonus Starpoints offer) on Sunday and was upgraded to Starwood Preferred Guest Platinum Elite on Monday evening (approximately 24 hours from the time of check-out). However, even though my SPG and Marriott Rewards accounts have been linked since a long time ago, the status on my Marriott Rewards account has not been updated (even after 60 hours or so). I will definitely update this article once the status has been accurately reflected to give people a rough idea on how long it typically takes.
Update: Marriott Rewards is now Platinum Elite - took approximately 3.5 days from the time that my SPG account was upgraded.