Just completed it!
13h 25m
Just completed it!
13h 25m
Just completed it!
13h 25m

at finished in 17 hours, I think I have played some 25 hours and only finished ~40%
Just completed it!
13h 25m
Just completed it!
13h 25m
I think I'm on about 18h 30m now with 52 missions done 

Just completed it!
13h 25m

Blimey, well done!
A lot of re-loading going on was there?
Perhaps a typo, maybe he meant 23hours.
.