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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.
This time I'm taking Cialis. Viagra works faster than Cialis which takes 1-2 hours to get to their maximum levels but Cialis lasts much longer, an effective time of 36-72 hours compared to Viagra 4-8 hours.aking 10mg helped me hard for about 16 hours. Taking 20mg gave me like over 2 days worth. Cialis will work if your slightly aroused, it mainly works from stimulation though. I can literally feel my dick sucking blood into it after maybe 15-20 seconds of gentle stroking.