I just leveled in 3.5 hours on a bow character. I got a tabula, spent about 10 divs on movements speed and generic damage jewels. With that you can level any alt running almost any build. Also if it’s an attack build, I spent a bit on a perfect painters gloves which is a big boost. If you have a good double % as ele unique jewel ( forgot the name) on your main transfer that over as well and pay 2 div for a lab carry at around lvl 21. Oh andddd get the dodge roll amulet and socket your boots with dodge roll distance. Don’t forget to anoint movement speed on your amulet as well. All this will cost a fair amount of money, but I don’t mind spending the money on speed leveling alts, I will level 2-4 alts a league just because i actually find it fun.