Depends on the acid man, for example I took 3 tabs today and it was pretty bunk, then another time I took one tab and tripped like crazy for 10 hours.
That depends on how much is in the tab. You should ALWAYS know how many hits you're doing. If you take half a hit you will trip lightly, it's pretty nice. Since I'm a college student I know people who will take half a hit and walk around campus, find a place to smoke a bowl and just enjoy the day. But if you're buying acid from someone who doesn't tell you how many hits you're buying, I wouldn't want it anywhere near me.