u need a file editor such as biggui for starters. u need this type of file editor so that the file will still work afterwards. download it, then go to your install directory for fifamanager and look for the file named config. open this file with biggui. at the bottom of the page you will see a folder named tcmai.ini. export this file to somewhere on you computer then open it. scroll to the bottom again,then scroll up till you see the line
half_length = 6
Change 6 to whatever you like and save as same file name. now go back to biggui and import this file, it will ask if u want to copy over, well, obviously you do. close biggui, run fifaman11. voila, no more super long games!