I do believe that hands only takes 3 run throughs to see everything you can see (3 classes, 2 main factions and the merchant/mercenary deal), so, for it to take 60 hours, you would need to dump 20 hours into each playthrough, and that could get boring.
I think the longest game would have to be master of the secret sea. Count on spending at least 40 hours figuring out what you're even supposed to be doing.
i agree with shintetsu: if you do all the stuff you can do in hand of war, with all the 3 classes, all the faction, all the quest, i think it's long, very long