It was just about an hour or two. Let me quote my mind:

If I’ll buy this app now, I won’t be able to buy any other app ‘til i get a new iTunes card. I know in near future I will get mad about having bought it, cuz I know I want another app, but forgot which one.

Well, before 10 minutes i recognized: I wanted to buy MiniGore.

Damn you, Real Racing, for being that expensive ;P