I just quit my job, and the first part is what I did, pretty much. Though, I came in with a reasonable offer (and in line with the employment laws here in Belgium). We then negotiated a bit and now I'm just redrafting my official letter to take that all into account. In my area (academia research) there can be a lot of training required (it took me about 6 months to get everything under my belt, but I think for the new person it should be at least half that since I've refined a lot of the material). I just hope that they can find someone sooner rather than later!! :)