Video Guide:How to Power Level Crafting classes

[Welsper59]

I might mis-understand you but I think in your video you are saying leves that requires 3 items will allow multiple turn ins?
But I'm currently leveling my alchemist, and the lv35 leve of 3 hi-potion of strength doesn't allow multiple turn ins, while the lv40 leve of 5 items(forgot the name >.<) does allow.
Just wonder if there is a way to tell this multiple turn ins without actually try it...

It's pretty much any leve that requires you to travel for turn-in will NOT allow multiple turn ins. For leves that you accept and turn in at the same location, those will always allow multiple goes.

Edit: sorry, mistook what you said for something else. For alchemy, I guess you can tell depending on the yield of the synth itself. Like if it's 3x yield per synth, it's equivalent to 1 for any other item. So if it were to require more than just the 1 synth (3 of that potion), it's probably a hint at multiple turn ins.