I crossed this border too two months ago. Quick and painless. Uruguayan customs demanded to see my Mercosur-valid insurance, which I, of course, provided as I got it at no extra charge when I bought insurance in Argentina (50 ARS a month, about 13 USD)
Only time I've been asked for insurance papers during my trip.
They stamped my passport for 90 days but my bike got a full year. I left after a couple of weeks anyway.
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