Epson 440, 600, 640, 700, 800, 850, 1520, 3000, EX User Manual page 34

The Priority list becomes active. Click the arrow and select one of
the following settings:
Normal prints the job in the order it is received
Urgent moves the job before any Normal priority jobs in the
print queue
Hold holds the job in the print queue until you're ready to
release it for printing by clicking the
Print Time opens this dialog box so you can set a specific day
and time for printing.
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