So, your Time Span definition would be:
Symbol
NON_BUSINESS_HOURS
Start Time
Year +0 Month +0 Day -1 Hour 19 Minute 0
End Time
Year +0 Month +0 Day +0 Hour 6 Minute 59
Trigger Time
Year +0 Month +0 Day +0 Hour 7 Minute 0
The Where Clause for your stored query would be:
open_date >= StartAtTime(\'NON_BUSINESS_HOURS\') AND open_date <= EndAtTime(\'NON_BUSINESS_HOURS\')