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Not sure what the time limit is for Morrisons, if you're there all day (which is what you hope) then you'll be better off parking on the side of the road (mile end road) don't want to come back to a parking ticket!
It probably comes down to how much prompting etc you need. If they ask you a question and you fire out all the points you wanted to put across, with no input, then the interview will fly over.
Had my interview last week. Mine was a similar length of time (around 25 minutes) as f1nch26 alluded to, i feel the questions were relativity straight forward. Didn't need any prompting, they were scribbling down continuously whilst i was answering. Came out of it feeling i had said all i wanted...