How long do I wait for parts paid for before becoming a dick! ADDED SELLERS NAME !!!

I would try to talk to him and let him explain why the wait.
Give him one last chance to make it right. Then if you don't hear or receive tracking number, then do somthing (is he a member here?). I will tell you one time I waited over a month for new marker lights for my 68 Dart when I sent a few nasty emails, he replied and told me a close family member of his passed away. A month in my opinion is not crazy long, but 6 weeks is... good luck