This is going to vary so much by location, individual, and year.
My background is different, but some parts of the job hunt experience are pretty universal (I wrote about my most recent one here anyway, at the request of a few former community members.)
When I was working on getting my first full-time developer job, it was about 5 months between my first interview and accepting an offer. That was after 3 years of groundwork. My last job hunt was about two months of intense work, but some of my (generally more experienced) coworkers who got laid off at the same time took the better part of a year to find new jobs.