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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.
A good rule of thumb is to take Viagra 45 minutes or an hour before you expect to have sex. After a few hours, its effects lessen considerably, so timing is of a concern.Unfortunately, there's no one-size-fits-all answer to this question. How quickly Viagra works will depend on how much you have eaten, whether you've had any alcohol, and other personal factors.The best way to find out the answer is through practice, either alone or with a partner.fter a few hours, its effects lessen considerably, so timing is of a concern. Unfortunately, there's no one-size-fits-all answer to this question. How quickly Viagra works will depend on how much you have eaten, whether you've had any alcohol, and other personal factors.