Thanks guys - I know it will take a day or two (at the minimum) post-interview to get any (big if i hasten to add lol!) job offers, I probably phrased my post badly. I really meant that if i am blessed / fortunate enough to do well at more than one interview (unlikely i'm sure!) and receive an offer for one of the jobs which i would least like, before hearing back from another employer, would it be acceptable to ask for a day or two to think it over (in the hope that i would hear back regarding the more preferred job in the meantime)?