The building Petronas will open to tourists visit in the SKy Bridge since 9.00-17.00 PM. Every Tuesday to Sunday. Stop Monday. So if you plan to visit the building Petronasก็ should avoid Monday.
A watch Sky Bridge is free, but I said that the limited number of tourists visit, no more than 1 400 per day. So it must line up waiting in the queue before the bills will begin distributing in time 8.30 pm each day. But you are right to a row before that time.