I've only been practicing for a year, but am halfway through the "color scale", so now belt advancements stop coming quickly. If I continue at the normal pace, working up through the rest of them will take another four years or so. For me, now is a good time to forget about rank, or at least put it in the back of the mind, because it will be a very long (but enjoyable) trip, and to lust after the next belt color will just make it frustrating. Brown is a year and a half alone at my school.
Especially important to forget about it because I know I could swap schools within the system and "get" a black belt much faster (villaris, ya know...heck I could get one in the mail).... but as my instructor says, you could get a black belt faster, but if you put in more time, and more practice, you could be so much better, which is why it takes a while at her dojo, and that's also why I stay there.