Gany, Great to hear that you are feeling happier about things.
The 3 day period of effectiveness sounds odd. You have certainly read the
www.viagra.com advice:
"Know what to expect
You will not get an instant erection. You must be aroused for VIAGRA to work
VIAGRA usually works in about 30 minutes
VIAGRA works for 4 hours, so you can take your time
After sex, your erection will go away
To get the fastest results, take VIAGRA on an empty stomach or after eating a low-fat meal
Make sure you buy real VIAGRA
Many Web sites will try to sell you fake VIAGRA. So before you buy VIAGRA online, learn what to look out for."
So they say 4 hours, I get 15+ hours and you are getting 72 hours?
I wonder if you are taking the lowest possible effective dose. For recreational use you should not be getting any added benefit by taking more than 25mg ( most pills these days are 100 mg )