This PoM concert lasts about 3 hours, but you need to be prepared for delays. Sometimes the concert starts on time, mostly there's a 5-10 mins delay, but there were a few times when there was a delay of more than half an hour.
Also, if you're planning to go queue for goods, considered your entire day gone.
But that's only if you are planning to buy those really popular goods, otherwise, most of the merchandise will still be available for sale after the concert ends. I normally buy goods then because there's no queue and you can get your goods in 10 minutes, as opposed to waiting in line for hours before the show.
Have fun!! This tour is truly amazing! ^^