Once you have farmed your honor you're stuck doing these quests still if you're one of the many classes where your bis in arenas is certain PVE pieces.
You have to be trolling with thinking 90 minutes was an UNDER estimation. If anything, it is an estimation on the high end for a very average group. In a guild there is no time organizing the raid you have a schedule. There is no ninja'ing in guild runs. I don't know what we're even discussing here. You're just arguing to argue for some reason.
Even if I was to give into your bait and we are forming the worst pug imaginable where we are needing to replace people, there is not a universe where it would take longer than it does to complete all of the raid loot quests on blackrock.