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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.
There's no set answer for your question but I can tell you this. Taking the pill does not give you an erection... it ALLOWS you to achieve one through sexual stimulation. For me, less than 30 mins after taking a 100mg Viagra it's in my system enough to get an erection. Also, I've been able to get an erection 16 hours after the one pill was taken. But then again, it's 100mg I've been prescribed.