Originally Posted by
Azerate
Ok, so number one I doubt they will start at level 20 in Shadowlands, because if the current level 120 = 50 in SL, then current level 20 would be something like level 10 in SL, or possibly 5? So I'm guessing they will start at level 5 or 10. Maybe it was explicitly stated at which level they started but I haven't been following.
Secondly, they said during Blizzcon that the whole leveling process will be 50-70% faster to the max level, but we don't really know whether they meant with or without heirlooms, with which methods, and in what way. We also don't really know how long it takes for an average person to level. While a competent experienced players can get to 120 in like 25-30 hours with normal methods, it's probably double that for a random casual.
Not sure what point would leveling it to level 30 in BfA have, unless you somehow believe that by doing that you will end up with a level 30 character in SL, which is not the case.
Bottom line is...leveling will probably be quicker than standard methods now, but keep in mind that we still have Korrak's Revenge BG available for leveling now, and the leveling process in Shadowlands will most certainly not be quicker and easier than afking in Korrak's Revenge is at the moment.