Playtime to 100...

[tundra622]

the fastest time for horde i have seen is 5:17, alliance i have heard 4.5 hours from 90-100 single player. regular players with no knowledge will take 12+ easily
http://elvinelol.com/forums/forumdisplay.php?49-Guides has 90-100 speed leveling guides for both horde and alliance, have a browze through that if your interested. the horde guy has his run through on twitch stream archive so have a look at that also, it might be usefull

as for collection quests i leveled from 90-96 with a friend and mostly everything shared, wasn't an issue

[zenga]

That is crazy fast?!! per level or all 10 levels?

I might do that for other teams.. but I think i will take my time with the first team. It is nice to know that IF you want to level fast.. you can!

Those were the times my friends (who try to get servers first) roughly got on beta, purely by questing.

regular players with no knowledge will take 12+ easily

No knowledge of what? The map layout or combat mechanics? Because questing is fairly straight forward.