I had a mishap a year ago while making love and I just went limp. That bothered me so much I went to my doctor and he prescribed Cialis 20mg. Now, I am hooked on the stuff and take it every 36 hours. Yes, I've seen the commercial and it say's to seek medical attention for an erection lasting for more than four hours. Like Hell I will. I am praying for one that last for two hours. I can only dream of four. Have any of you guys out there ever had one last for four hours? If not, what is the longest (pun) sustained erection you've ever had?