The artifact quest time takes 15min, I messed up multiple times on the videos and missed 2 quest areas that are mentioned in the guide. I've dinged 110 in 6.55 last time I've used my guide. I haven't uploaded those videos because of my internet limit. You literally spend less than 2minutes in dalaran as mage since you have a teleport to your class hall.
Also levelling doesn't really slow down up to 110, as you can see by me getting 107-108 in 38min, every single level is about 35-45min (even 109-110).
100-101 is actually the slowest one since you have the 15min artifact quest and then the flying to your first zone (atleast the mage artifact quest barely gives xp, and I don't understand guides saying they're good xp, since for mage they are horrible xp).
As someone pointed out already, mage isn't a very fast levelling spec, it goes so much faster on my rogue.
I love how you are criticising the timing while I'm the only person who actually provided some evidence, instead of ppl claiming 6 hours with 0 proof. If you actually watched the videos, I even type in chat on the video what I messed up and how to improve it, so you'd clearly see how you can decrease the time even further.
Levelling time even increases further if you run the dungeons when you get the quest, but this guide does not require them.
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I only used the shadowmoon guide to enter Anguish fortress to collect the treasures there, it helped me a lot to get into gorgrond before everyone else even though I was far behind everyone else at the start because I couldn't login , so thank you^^
For me the garrison was not an issue at all btw