For new members, it's 12 months to achieve the initial level. 150/300/600 Q points. Then it's a reduced amount to re-qualify. As soon as you achieve a level, the clock starts ticking for renewal within the next 12 months for that level. For a 12 month period you would only need 540 Q points to renew at Platinum, or else they would also look at the previous 2 years to see total Q points. Not sure if it's 1080 for the 2 year period.