User blog comment:B214/Talk About What You Want! 2/@comment-74.77.52.225-20140801025045/@comment-202.152.202.139-20140801154452

Other reincarnated devils might take that long to gather or prepare everything to become a High Class Devil, but Issei is an exception. He has Rias, Sona, and Sairaorg to teach him everything about high class devil. How to spend his money wisely? there is Ross who can help him, how to manage his schedule or even develope his territory ?? Ravel is there to help him. Partnerthips ?? Azazel has grigory on his back. Increasing his fame ?? Ravel's brother could be useful. Friends from high places ?? There are so many to list. Seriously, what needs to be done in ten or even hundred years can be shortened thanks to Issei's "social skill". If it's Issei alone doing everything then yes it could take hundred of years. You know it's just interesting to see Issei doing city tycoon in this series, so why not give him the chance??.

Oh yeah about Pure Blood family who dont like him, Issei just saved their asses in Vol 12 so that's gotta count something.