A few days ago an ending screen of Metal Gear Rising Revengeance appeared on the internet, displaying a finish time of around 5,5 hours. Since then, people have been worried about the game’s length, assuming this was an accurate representation. But accroding to the game’s producer Atsushi Inaba, the game is much longer than that timer indicates. He explained:
It seems someone posted their MGR results screen and that people (mainly in the West) are shocked it says the clear time is 5.5hr.
Here’s the truth: First of all, cutscenes ARE NOT INCLUDED in that counter.
Next: For every chapter you play in the game, it ONLY COUNTS YOUR FASTEST TIME. It doesn’t track your total play time.
What that means is if you replay a chapter for 10 hours, but you finally clear it in a time of 10 mins. Only 10 mins will be counted.
So please don’t get fixated on that end screen Clear Time being total game time because it is not.
As I said, it is not how long you’ve had the power on playing MGR, it is a record of your best efforts playing the game.
We came up with this clear time counting system as a way to fairly evaluate players. It hasn’t changed since Bayonetta.
However, I will say it is really disappointing that people try to use a single screen in the game to try and create negative buzz.
So in other words, don’t let this judge whether to get the game or not. It will obviously last you longer.
Countdown to greatness. Feel sorry for these nikkas. 
PS3's
