Levelling to 60 can be done very quickly in terms of /played time if you focus on that alone. That means no PvP, only playing with rested XP, streamlined questing, grinding on green mobs, no unnecessary travel, no tradeskills and no idling (like hanging out in a city to browse AH etc). You can get to 60 in less than 150 hours played solo with any class. If you have help (from friends or your guild) you can cut a lot of time by being powered through some instances in minimal time.
More commonly - and for a better game experience - take it slower, enjoy the game and have fun. It might take 12 to 20 days /played time to get to 60, but the journey there will have been more satisfying.