Cooling time for a new AC

Hello friends I am a new user of AC. Lg 1.5 ton 5 star dual inverter I wanted to know how long it takes to cool a room usually from say 33 degree celsius to 23 degree celsius. (If we assume all other variables like room size or insulation and sunlight exposure to be proper) I notice my AC takes half hour to bring down to 27 from 33. So I see normally 5 to 6 minutes per degree Honestly I think it's slow but wanted to know what time it takes usually. If anyone can share their time taken it will be very helpful for me.