I started one today.1 neighbor can do only one thing per quest.EX... I needed to buy carrots,lettuce,pumpkins,and cabbage...then load them into the zoo feeding for hippo food.
The downside is that you need to constantly check to see if your neighbors come online.My quest is 23 hours...going to be hard esp. if any neighbors planted 2,3,or 4 day crops and won't be online for a day or 2.
On the upside...more reason to talk to a few of your close neighbors and work out a strategy.