Basically, this is Max% but without any glitches. It was at some point estimated to take ~40 hours (May not be accurate)

Use whatever the Glitchless Any% route says to train all 34 ducks. Focus on getting coins. You need 5,050 just to buy all the items. You need 750 coins per duck for energy. That is 25,500 coins total just for energy. (That's 30,550 coins in total) You only need to beat the champ once. You need to beat every race, even the unnecessary ones.

Good luck!