If you have the right build it's not that difficult, though the wait times are kind of crap sometimes. (Still worth if for all the frags and 6 scrolls. I've maxed out all pains except tendo already. 4 or 5* a ton of other people as well.) Most people can hit it within a day or 2. But the wait time is atrocious once you hit even the bottom of the 6-path ranking. I had wait times over 30-60+ minutes consistently. Once I waited way over an hour with no one showing up, so I just left. (But that issue is only once you hit 6-path so whatever. I got into a point battle with another guy in our server. Ended up with 68 points. But the last 3 points took at least 2+ hours of waiting to get.)

I would like to see some of the more rare ninjas in there though. Even if it's at a reduced frag count.