I've been answering a lot of questions online in various forums, via email, etc. lately about the time frame for adjusting status after marriage on a K1 visa. I'm not sure why this happens, but perhaps people do not understand the K1 visa process. It could be that they cannot afford the adjustment of status filing fees. (The fees are quite expensive--about $1400 now.)

In any case, there is a 2 year deadline to file for adjustment of status for K1 non-immigrants. If you are unable to afford the fees for the adjustment of status petition you can request a fee waiver but they are difficult to obtain.