@supermonkey123 I think you have that a bit backwards, it seems instead that he spent so much time training before setting out that the demon lord had time to sense his summoning and send one of his/her four generals to scope out the newbie town in the hopes of crushing him before he even begins his hero journey
...of course if he HAD finished a grind up to max level before setting out, then he might have actually stood a chance a doing better than just running for his life in that encounter
so really either way, if he hadn't waited so long and already left the beginner town on his journey OR if he'd just gone all the way to max then he wouldn't have run into that much trouble