Levelling the Necromancer is great because he can churn through mobs with appalling speed at normal difficulty levels, which means you get new skills to play with every 10 or 20 minutes. (pcgamer.com)
The demo can be played in Hero and Normal difficulty levels by default, and Hard and Master Ninja levels can be unlocked to challenge even the most skilled ninjas. (totallygn.com)
In his response, Pessino said that internal tests of the game at a regular pace and normal difficulty level lasted between 8 — 10 hours. (playstationlifestyle.net)