How long is Devil May Cry 1 ?

I am currently on the 13 mission. How much left ? I played only 3 hours. I hope it's at least 6 ours.s7aTyC

iirc theres 20 missions 

First i plyed DMC 3 so i had a good impresion but when i buyed the one he was so bad that i finish him with sucha boring feeling.

DMC 1's enviroment is like a picture.

But it's still a cool game in his time. 

I've played every titles from DMC (1,2,3 and special edition). the first was good, but the years past and finally the third title is great.

All titles have 20 missions each.