Seed Throwing

Completion
Watermelons can be found in the Crops section of the Market. They cost 2,654 Silver Coins each to plant, and take 36 Hours to harvest.

75 Watermelons will cost a total of 199,050 Silver Coins, but when harvested, will return 5,308 Silver Coins each (for a total of 398,100 Silver Coins), exactly 100% profit. They also provide 1,843 Food, making it unprofitable to Speed Up the harvesting until there is less than 8 hours left on the timer.

You should expect this quest to take at least a couple of weeks, up to a couple of months to complete.