Bosses in heroics drop 2 shards per kill, and majority of the heroics have 5 or fewer bosses, so going with the 10 per 30min rule, it would take you ~2 hours with travel time to get to 3 instances to get 2k honor, netting you approximately 1k/hr...aka a pretty poor rate for honor.
They are a nice way to pad a couple points to grab a new piece "today instead of tomorrow" type thing, but instances aren't really a viable way to "farm" honor. Especially considering every2.5 hours you'd have to go win WG again just to continue farming.
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