How long does viagra make you have a hard on?

[Aplopez8]

Is it breaking the rules to ask for sources for Viagra?

 

[dew925]

Asking for soures "Period" is in violation of forum rules!!!!!!!

 

[TestGuy663]

usually 5+ hours for me in general.

 

[shean_u]

viagra works for me up to 4h while cialis still woks in the morning of the next day...