How long is Shippuden?

Exactly as my title says, I'm wondering how long Shippuden is in universe. We know the 4th great war is only 2 days at least, but other than that I can't really remember any other time being mentioned having passed. Of course it has been a rather long time since I've read Naruto so I could be completely wrong, but if I am I'm willing to take it lol.