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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.
Best Answer: 100mg is a lot. Viagra helps to get it up and stay hard but you still need contact of some sort. After a orgasm it will some what go down but does not take much to get it back up. Its like semi hard. After taking 100mg the next day at work if my pants rub it the wrong way it would start to get hard.est Answer: 100mg is a lot. Viagra helps to get it up and stay hard but you still need contact of some sort. After a orgasm it will some what go down but does not take much to get it back up. Its like semi hard. After taking 100mg the next day at work if my pants rub it the wrong way it would start to get hard.