Just NO.
Its a 20min instance. less than that. Last time i did a full clear i still had 5mins left on my 20min Shadow Protection buff.
Yet, for some unknown reason, I have had 2 separate groups in random heroics wanting to skip the middle bosses. Why? 3mins saved for the cost of 2 triumph badges. I cant understand the reasoning. Its one of the easiest instances in the game....