In #msg-72547807, I’m talking about trading during regular hours on the US Pink Sheets, but after the close of the European exchanges—i.e. anytime during the afternoon NY time.
To place an order that will be eligible for execution during the extended hours trading session, access extended hours trading during the session hours. Orders may be placed in the extended hours trading sessions Monday through Friday, from 7:00 to 9:15 a.m. and from 4 to 8 p.m. Eastern Time except for weekends and market holidays.