According to my CR it was opened on September 11th, 2018. I had requested 3x cli on December 14th and was denied citing "tenure with AMEX too short" and "scoring of your credit" at 699 Ex Fico. Pushed the button today for giggles and got the increase with 714 fico.
Congrats on your Amex Delta Gold 3x CLI!
Congratulations on your CLI!