samsung s9 Charging time

My new Galaxy s9 is taking around 1 hr 39 mins to completely charge the battery. I checked with Samsung customer care they said it should take normally 50 mins to 1 hr.

They did some test on mobile to see is there any other app is preventing to charge, but nothing helped to see the problem. So before I send the devices back to them, I just wanted to see did any of us is facing this kind of issue or is it normal to take this long?