Cherry Jam Mission Changes

It takes 18 minutes to produce cherry jam. Even if you have one ready to go, it's impossible to produce 270 in a single factory within 30 minutes.

I'm well aware of the fact that you can have up to three jam factories, and that it's possible, in theory, to fulfill the minimum requirement IF all 3 of them are making cherry jam. Given the amount of cherries and fruit sugar required, not to mention having enough available workers and space on your farm to place three factories, it's not actually feasible for a lot of players. Not everyone is willing to spend gold to speed up the harvest, or has a Stackmaster available to shelve it immediately. I have two jam factories as well as a Stackmaster. Despite that, I'm constantly getting stuck on this mission, and I'm tired of spending gold to get through it and move on to the next one. 

I suggest lowering the minimum requirement to shelve the mission, as well as reducing the amount of time it takes to produce the jam. It would make this mission less frustrating for everyone, particularly lower level players.