The counter is the same as the one in Bayonetta and Vanquish.
An image came out yesterday showing that Metal Gear Rising: Revengeance was beatable in 5 hours, but that’s not an accurate image. Platinum Games producer Atsushi Inaba has revealed that the counter shown at the end is inaccurate for checking overall playtime and is only there to judge the players accurately.
What he means is that the timer doesn’t count the cutscenes or the times you die in the game and will only take into account the time it took for you to clear a level in one go.
“About to post some important tweets, so please pay attention. 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,” he tweeted
“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.”
These all come in a series of tweets but you can check out his official Twitter account over here.