I've had my Discover It card for 9 months. I started with a CL of 7000, and they gave me a small auto-CLI to 7700 when the 6th statement cut. Today it had been 91 days since that increase, so I hit the love button and got a huge 4000 CLI. They're now my largest CL at 11,700!
I've been using the card as my daily driver since the double cashback promo started. I've been carrying a pretty high balance for months because I'm still in my 0% APR period, but I also make large payments every month. My TU score has gone up by about 50 points since I got the card.
