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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 is for people who have a medical problem called erectile dysfunction; taking it if there is nothing wrong with your penis could end up being plainful. If you need other advice in this area, email or IM me. I'm eurotrash050@yahoo.com.eport Abuse. Usually just under an hour. The time depends on how much you have had to eat and drink. On a full stomach it takes longer. It stays in your bloodstream for about 4 hours. If you are a quick shot, it won't help your girlfriend.