Is there a best default size for an input field (not in a form)?

I am designing a game-related web application. At some point I want users to complete a few information steps about them, one of which is to list their favorite game titles.

I am wondering if there's the best field size for this kind of input? Not to small, but not to big either, however games can have different names length. At some point, when the title is even longer than the filed, it would move to the left inside the field, but what is that point?