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Visine is a vasoconstrictor. It is not designed to make you vomit, it is designed to make blood vessels smaller. Oral ingestion of Visine is dangerous because it can lead to all sorts of complications, the least of which is vomiting. Because of that, we can't give you an exact answer.

You would probably have been better off using Syrup of Ipecac, which is a readily available emetic, or even mustard dissolved in water would have worked (1 teaspoon of mustard in one glass of water).

The good old fashioned fingers-down-the-throat trick is, however, a very effective emetic as it directly stimulates the vagus nerve and leads very quickly to emesis. Of course regular throwing up is not good for your oesophagus as it will get burned by the acid reflux.