EvolveHQ is allowing you to import your Xfire hours to their client, there is no guarantee this will work. It seems like a neat idea, I know Phobos mention Raptr doing something like this too:
https://blog.evolvehq.com/2015/06/goodbye-xfire-we-will-miss-you/
Edit: I see this has already been discussed, but incase you missed it, or was wondering how to go about it.
why would someone want to import hours anyway... lol, like it matters.
For me it's more a reminder of the games I used to play than the hours. Although it would have been nice to get to 1000 on battlefront, I was almost there and never left the game running without playing .