Hyrule Warriors - How fast can Young Link level up with his most "basic" weapon?

Short Answer : If you're more adequate with combos than I am, Young Link breaks the sound barrier. You can possibly go up to level 40 in one 10 minute sitting if you're quick enough, 60+ if you have EXP+ and the mixture for EXP.
In other news, Phil and I can now co-op as Link and Link.