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Really that long to normally wind it down. The town where grew up had a mobile mri back in 90s. It would show for about a week each month. Would they turn it off over the last day to move it?
Last I heard from my father was around 4 hours for theirs. Though he's an Anesthesiologist so not directly involved in those processes.
This was almost certainly an older style of MRI that didn't use superconductors. You could turn these off and on, but the strength of the magnetic field was much lower that what can be achieved with superconductors.
I also looked up the wind down time and I was mistaken. It's a day long process to wind down and wind back up and MRI and do all of the testing and adjustments, but the loss of the magnetic field happens in a few hours. I edited my post.