Its hard to tell how long it will take. I've only recently been given an offer, but it was just a provisional offer. I have no idea how long it will take for the rest of the process. As far as I'm concerned, they can take their time. I still a while left on my current lease.

As far as moving there before the opening, it depends on what level of employment you are at. They told me that if you go there before the opening, you will assist in set up and departmental planning. Which is fine by me.

What job are you applying for?