Answer:

WHEN

Answer	Crossword Clue
WHEN	"Say ...!"
WHEN	Interrogative
WHEN	"That's enough"?

WHEN	Party-invite datum
WHEN	Timely question?
WHEN	At the same time as
WHEN	Timely question
WHEN	Appointment particular
WHEN	"Say ..."
WHEN	Invitation line
WHEN	Timing concern

WHEN	Question of time
WHEN	Something to say
WHEN	What to say to get someone to stop pouring
WHEN	"Stop pouring now!"
WHEN	Invitation word
WHEN	".. in Rome ..."
WHEN	At what point
WHEN	".. Harry Met Sally..."

WHEN	First word of the Declaration of Independence
WHEN	Questionable word?
WHEN	"Stop pouring"
WHEN	It's a question of time
WHEN	Quotation, Part 3
WHEN	"That's full enough"
WHEN	Appointment question
WHEN	"At what time?"

WHEN	Something to say?
WHEN	"Thanks, that's enough"
WHEN	"... pigs fly!"
WHEN	"On what date?"
WHEN	Evite info
WHEN	"Where or .."
WHEN	Reporter's question
WHEN	At what time

WHEN	"Stop pouring!"
WHEN	At which time
WHEN	"Say ..!"
WHEN	A question of time
WHEN	A question of timing