Diligent Explorer Medal

So, this one seems like the only one that I can do. I have a few questions:

1) Is it permanent?
2) What are the stats?
3) Do I have to be on for 3 hours without logging off or can I log on for 1 hour, then log off, then do the 2 hours later?
4) Can you just be AFK for 3 hours?

Thanks for all the help.
Any additional help on this medal would be appreciated.