Filed from 2 published puzzles

BESTRONG

Set to 2 different clues across 2 published puzzles, most often "Hang in there!" — The New York Times, Friday, 29 October 2010.

8 letters

Every clue on record, most used first

"Hang in there!"once
The New York Times — Friday, 29 October 2010
"Don't give up!"once
The New York Times — Friday, 12 June 2009

Other answers to these clues

BECOOL6 letters
ENDURE6 letters
LAST4 letters
STAY4 letters
TRY3 letters