I was checking to see how much exp would be lost if you skipped the introductory quests in Legion. In Warlords of Draenor, I was never bothered by doing the Tanaan introductory scenario because it was easily half a level and the quests were relatively quick and painless. (30-60m max)
In Legion, after you complete the introduction once, you can subsequently skip it, but I wanted to see how much exp was lost.
Quests 1-5 don't even give experience and the introduction took me roughly 45 minutes with the beta bugs and knowing exactly what to do. At this time, I'd recommend skipping on subsequent characters based on exp/hour.
As a note, it appears that these quests don't even reward experience, so I'm not sure if that's a bug or not.
1) The Legion Returns <- Option to skip presented here
2) To Be Prepared (I believe you can turn this in and still skip.)
3) The Battle for Broken Shore (Forced into a group for a scenario minimal exp -- 20-30 minute scenario)
4) Fate of the Horde
5) Emissary
6) Demons Among Us (group kill exp, if swarmed) (15k exp)
7) Keep Your Friends Close (3750 exp)
8) In the Blink of an Eye (You skip to the turn in of this quest)