My first paid app was FeedR and it started immediately. Just as quick as a free app would.

 

my first go at a paid app was GDE the home experience (which lagged like crazy). anyway, it was speedy. perhaps it hung up. perhaps u had signal interruption (ie, the signal dropped off momentarily, or was too weak). that can cause a hangup in transmission. try again, they cant bill you twice, and you can always return the app within 24 hours.

 

I bought the full version of Robo Defense (1st paid app), and it took well under 2 min. to download and install. I'd say try again.