I am farming in the low 2600s and I am a th10 that has maxed out th9 defense except air defense (I was rushed but fortunately I'm catching up) and since they take ten days, should I upgrade 1 at a time to avoide being air raided. Should I upgrade all asap, and get them out of the way, or go 1-2 at a time to not be at as much risk?

