I have had this guy on the tab for three weeks plus now. I have several water certificates a couple are just ten minutes but as long as this guy is on that tab all my water certificates are unusable. This is super annoying. Every time he is down to one day I open the game the next day and there is he is again for 7 more days!
I am unsure of what he is supposed to do but make the certificates usuable at the same time since this guy is on there so much! If he is to make the farmers work faster then it doesn't work. They sit a LOT!