Originally Posted by Amol_108
if it is possible to Upgrade my existing fedora 13 to fedora 17 directly if possible then please tell me steps to upgrade and also tell me how much it takes time to upgrade...........
No, it's not possible to jump that many versions without problems. Back up your data, and do a fresh install of FC17. And it will take as much time as it takes...no way for us to know that, since it depends on installation method, speed of your machine, disk, etc.