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In clinical studies, Viagra began to work in as little as 14 minutes. For most people, though, it began working within 30 minutes. There are a number of factors that can increase or decrease how long Viagra lasts.owever, in most people, Viagra will last for about four hours -- although it generally starts to lose its effectiveness after a couple of hours.
Viagra takes around 30 minutes to become effective and lasts about 4 hours. Cialis lasts much longer -- up to 36 hours in some cases. Stendra can start doing its thing in as little as 15 minutes, and its effects last up to 6 hours.