So I was 3 days 18 hours /played leveling to 60, mostly questing but i did do a whole lot of exploring as well.
I prestiged which gives an exp bonus, allows using heirlooms which gives bonus exp, and popped an aura of exp.
I have no idea the final multiplier on exp earned but I'm lvl 52 after 9 hours played and I'm spending just as much time exploring this time as last time. I'm intentionally only leveling in zones I skipped on the first run to 60, but its very hard cus I'm leveling so fast.
I hit lvl 17 before even getting out of the lvl 3 newbie area of teldrassil, skipped the rest of that went to ratchet and did a few quests there, went to stone talon like 3 quests, desolace maybe 5 quests, then badlands and I'm 52. Gonna head to swamp of sorrows then blasted lands but I'm guessing I'll be 60 long before blasted lands. Still haven't done any lvl 60 zones like silithus, winterspring, eastern or western plaguelands, etc