Ok, I just reactivated my account last night and can now do /played. My guess in my earlier post was about 400 days played on my warrior and not a very significant time played on any of my alts. Here we go:
Warrior (level 90): 348 days, 15 hours
Warlock (level 85): 33 days, 5 hours
Paladin (level 85): 24 days, 7 hours
Death Knight (level 82): 5 days, 0 hours
Rogue (level 82): 10 days, 23 hours
So my guess was a little off, but combined time is closer to that 400 days. I do have a few alts that range from level 30 to level 70, but I doubt I have any significant amount of played time between all of them combined.