Viagra Erection - How Long Will It Last?

They say that Viagra erection lasts for 3 to 4 hours. Does this mean that after taking Viagra your penis will stay erect for four long hours? This is the common misconception with Viagra. People thought that the four hours effectiveness of Viagra means that a man under Viagra will have a fully erect penis for four hours straight! This is ridiculous. How will Viagra help me? Viagra helps men in achieving and maintaining an erection, which is strong enough to complete sexual activity.