Good and auspicious time to perform Ganesh Chaturthi Puja is when Chaturthi Tithi and also when Swati Nakshatra is present. In 2015 both Swati Nakshatra and Chaturthi Tithi is present from sunrise to 10:20 PM on September 17, 2015. So there are lot of good muhurat on the day to install Ganesha murti (Idol). The ideal time are given below:
The puja should be completed before 10:20 PM.