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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.
Your healthcare provider will tell you how much VIAGRA to take and when to take it. Do not take VIAGRA more than once a day. VIAGRA usually starts to work within 30-60 minutes. You may take it up to 4 hours before sexual activity.arely reported side effects include: 1  an erection that will not go away (priapism). 2  If you have an erection that lasts more than 4 hours, get medical help right away. 3  If it is not treated right away, priapism can permanently damage your penis. 4  sudden vision loss in one or both eyes.