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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 Time Line. As a general rule, Viagra takes effect 30 minutes after it's taken, though this delay can be as short as 17 minutes for some users. Once Viagra has had its effect, it usually works for approximately 4 hours.However, the effects begin to diminish after 2 hours of effectiveness.Its effectiveness can be extended with higher doses (Viagra is available in doses ranging from 25mg to 100mg).s a general rule, Viagra takes effect 30 minutes after it's taken, though this delay can be as short as 17 minutes for some users.