how long does a CD have to seel before it is certifed as something?

Question

u know how GOLD means a CD sold 500,000 copies and platinum sold 1 million copies???
well for how long does the sales count for??? is it a year, 2 years or what before it is certified as something?

Answer 1

Gold is 500,000 copies, Platinum is 1,000.000,000.
time elapsed since release, does not matter.