This shows how different people areone user says the game is 3 hours while another says it's a long game. one user says the game is piss easy while another says he had to break out cheatengine to beat it.
I played it on normal difficulty. Took me maybe half a day to finish one path. Then starting from where you can decide the paths again maybe 1 hour for the second path.
Would say if you walk through all the areas and kill all the monsters on your way you would not need to grind.
As I got lazy halfway through I had to do a little lelvelgrinding at the end. I finished it with the main at Level 30 and the support at around 28. As a little hint the endbosses are vulnerable to cold.
There is no game+ after you finsihed. After it plays out the endstory you get a new house, some new options in the trainingcenter unlock, and there is a new dungeon. So unless you want to finish her training there is not a lot to do after ending the story.