How quickly does a game have to hook you before you put it away?

[alekth]

These days I usually know what I'm going to like when I buy it.
Though from the time I was wrong, I'd say between 1 and 2 hours, and then the same maybe 2-3 times more over the following weeks.

I haven't bought anything really awful that I wanted to get rid of right away, at least not in the past 3-4 years.