RE: real time quotesI'm not sure if this is what your after -
Trading Specs – Open outcry trading is conducted from 9:00 AM until 2:30 PM.
Electronic trading is conducted from 6:00 PM until 5:15 PM via the CME Globex®
trading platform, Sunday through Friday. There is a 45-minute break each day between
5:15PM (current trade date) and 6:00 PM (next trade date).
https://www.cmegroup.com/trading/energy/natural-gas/natural-gas.html