I should think it would be fine if you stop every couple of hours to stretch your legs and walk around a bit. I was told 6 weeks for a plane flight, but that's different, involving cabin pressure etc and it's not quite so easy to keep getting up to walk around.
If you drive, the problem will not be the stents but the side effects of the medication that you take that probably will make you feel quite tired for the first 2 or 3 weeks until your body get used to it.
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