Dude, bite the thing in half....chew 1/2 tab in the AM.... real good. Then before you work out, chew the other 1/2.
Take it with a glass of water. I do it on an empty stomach with no problems. If you bitch about the taste you shouldn't be using gear! To answer your question, Winny has a very short half life....maybe 8 -10 hours.
Best Regards,
-G