If you're serious about Action Quests, prepare for a wheat farming grind

Leveling up means you need to scrape together experience points somehow.. You get experience points from growing crops too. For wheat, it takes 2 minutes for 1 XP. But you don't just have one field to grow crops, right? Don't have any special crops to grow? While you wait, farm wheat endlessly to get any extra XP you can. You can just sell the surplus anyway. If you're around level 17, you'll have about 20 fields. 40 XP every 2 minutes might not be bad? It's like getting the XP from one train car every 2 minutes. At level 17, an expensive helicopter order gives around 240 XP. Isn't it good if it's like completing one order every 12 minutes?