FYI, you'll get more experienced people with credit card "churning" in the credit card forum... I've heard that ~2 years is the point where Chase (Bank) will forget you. I've personally got the signup bonus twice, but I had ~2 years between cancellation and new card. I am in the middle of my second year with my current IHG credit card, and thinking of cancelling soon so I can apply again.

What is unclear is whether the ~2 year limit is from cancellation of the card, or the application of the card. With Citi AA/Hilton, it is the application/approval date that counts. I'm not so sure about Chase...