After switching to Chromie time, I was able to get to 70.5 before realizing a noticeable drop in xp gain compared to my level. Hadn’t even explored WOD yet. Levels generally took between 4-6 min depending on how close zones were and how much there was to discover in each zone.
Level 69-70 took 78,750xp
To level from 70-71 takes 225,105xp
When xp from discovering was about 3600xp roughly per zone, that 225k is gonna take a lot longer so at that point questing and dungeons is likely the better option.