Perhaps some people can post the system availability hours for their firms here for comparison. As far as "serious brokers", I'm guessing IB has pretty good coverage, particularly for hours during which you can actually trade something (i.e. not Saturday).
Assent is ~07:00-20:00 ET Mon-Fri.
Genesis, as of 8 months ago, was 08:00-18:00 ET Mon-Fri.
Assent is ~07:00-20:00 ET Mon-Fri.
Genesis, as of 8 months ago, was 08:00-18:00 ET Mon-Fri.
