I actually took the stretch between the CDC & Hershel's farm as being rather short. Rick's in Atlanta at the start, radioing to Morgan, with the plan of a 125 mile trip to Fort Benning. I can't say it's specifically the same day they get stopped on the road, but it's soon after they depart, and the timeline there has it as the same day, for what that's worthThe wiki timeline I just found has the fall of the prison only nine days before their first night in the church
http://walkingdead.wikia.com/wiki/Television_Show_Timeline
That's a pretty shitty week they've been having. lol
So, the series is now back to compact periods of time rather than undetermined stretches, such as the period between seasons 1 & 2.
I get the impression they'll have to do both though. We glossed over a long stretch of time before the prison, like a whole winter, between S2 & S3 & then glossed over some months living at it between S3 & S4, but barring some lack of specificity here & there, it's been pretty straight forward. I was just shocked that it's been so compact for that last 13 episodes
I also suspect we'll have some kind of stretch at the end of this season too. Might be interesting to have them do it in the midseason break for a change