Only a few months comic time. Maybe a year and a half or so?
But the shifting realism of the drawings of these people doesn't necessarily mean there's a physical change. I mean really, it's the same Faye as in those first few strips - minus some of the insecurities and violent tendencies.
With hips.
Personally, I'm perfectly happy to apply a willing suspension of disbeleif, and just appreciate the art for what it is!