Does the ES only have the trading break from 16:30-17:00CST during the summer DST? (There is always a break from 15:15 to 15:30 for session close, but I am asking about a later period).
See Barcharts profile:
http://www.barchart.com/commodityfutures/E-Mini_S%26P_500_Futures/profile/ESM12

"Trading Hours 3:30p.m. - 4:30p.m., 5:00p.m. - 3:15p.m. Mon-Thurs, Sun 5:00p.m. - 3:15p.m. CST
Last Trading Day Third Friday of the contract month"

E-mini S&P 500

GridKing 

E-mini S&P 500

Sat - wow I can finally get on!!!!!!!!!!!!

Geez - glad it was selected for me!
I sure didn't select it as the answer so I guess the admin did

I haven't been able to get into this section of the NexusFi (formerly BMT) board to read the answer for a week now, so sorry it no reply to your link Grid.

I have seen --
system connection timed out about 40 times .LOL

So no one knows when this started.
Was it when DSL started?

(I guess no-one cares.)

The Question is still Unanswered in my opinion.

I asked when did this start?

For many years it did not shut down from 16:30 -17:00
A half hour of trading vanishes and no-one at NexusFi (formerly BMT) notices?