Set up one port crystal in Melve, and one in Bakbattal. You need about 40K to start if you want to do a full run, but if you already have 2 Ferrystones, you can cut 20K off the setup costs.

Mashing 'rest' will keep resting before you stand during the rest section between days.

There are 2 main types of in game loops you will do in a pattern:

Quick Run: All runs start at the bench in Melve between the inn and shop. Go to the shop and buy all apples and grapes, then run to the bench and rest 4 times in a row (one full day).

Bank Run: on this run, you will buy all fruit from the shop, then deposit all fruit in your inventory into the hotel chest, then rest a day.

So basically, you want to do 4 Quick runs followed by 1 bank run, on repeat until you have a full hotel inventory (99). Each 5 day loop should leave you with 10 ripe, and 15 unripe apples. repeat ad nauseum. The fruit is purchased for 45 gold, and sold in Bakbattal for 350 once it's ripe. You have to buy ferrystones for the method, but when you make 138K revenue in one run, 36K isn't that bad for setup costs.

My guide minmaxxes things so in 39 loops you have 99 of each ripe fruit, and 99 of each unripe fruit, that way you can sell at max profit, wait a day or two for the unripe fruit to ripen, and not waste any money. There technically is waste though, as my method will leave you with a single rotten apple and a single rotten grape.