Do I need to leave the computer logged on FarmeVille all the time while the application is working?
You have to be logged into facebook/farmville while the application is harvesting,plowing or planting. While the application is waiting for the seeds to harvest and do the whole thing again, you can do what you want with the computer. However, by the time the crops are ready to be harvested, you should already be logged again and have farmville running in full screen. If you aren’t, Farming Extreme Manager will ask you to open Farmville. So, before going to bed, be sure to leave the browser logged and with farmville opened.