I play CoC on an iPad. I often use the timer on the iPad to alert me when my shield is about to run out or when the next builder is going to be free. I set the iPad timer to delay the time in minutes so I know there should be an error of up to a minute but when the timer is set for a long delay the timer often chimes 10 minutes before the event in CoC actually occurs. I have seen this many times. The Coc timer is is slow.

