of course one can do 174km or 250km on Schwalbe concrete tires, no problem at all. question would be: how does it feel like, compared to lighter faster tires....
Felt good. I don't recall tire performance being a concern.
When people resort to hyperbole like Schwalbe concrete to bolster their position I tend to discount most of what they say after that. Your positive review of the panaracer could also be just as over estimated for all I know. That's the downside to that.
I really don't get what some of you are arguing.
Its not what would you prefer to ride if given a choice? It's what's the toughest tire? Trying to suggest a light supple tire is tough(er) just shows a bias that can't even look past itself.
Arguing that you don't personally want a "tough" tire to champion your choice does not answer the question either. It just minimizes it to allow for your prefered rhetoric.