Answer:

while

Answer	Crossword Clue
WHILE	Fiddle away, as with time
WHILE	Considerable time
WHILE	Even though

WHILE	Vague time period
WHILE	During the time that
WHILE	Sandra Bullock's "... You Were Sleeping"
WHILE	As long as
WHILE	During
WHILE	Spend leisurely, with "away"
WHILE	Indefinite period
WHILE	"Whistle .. You Work"

WHILE	Once in a .. (occasionally)
WHILE	Short space of time.
WHILE	Space of time.
WHILE	During.
WHILE	As long as.
WHILE	During the time that.
WHILE	Short time.
WHILE	Period of time.

WHILE	Worth ...
WHILE	Although
WHILE	Mean or worth follower
WHILE	Churchill's "... England Slept"
WHILE	Period of time
WHILE	Time period
WHILE	Worth one's ...
WHILE	Indefinite wait

WHILE	Short time
WHILE	Effort taken