It has been my observation and experience that Chase will typically perform one auto CLI within the first 12 months of cardmembership.
After that, it is pretty rare to see one from them. As others have mentioned, heavy spend can sometimes trigger a credit line increase.
Chase will often remind you, but be sure to update your income in your online account management for the best chance for an increase. Because of the regulations created by CARD Act, banks are required to obtain income information on an annual basis in order to consider your obligations for credit line increase.
