stick-to-it-iveness
From Longman Dictionary of Contemporary Englishstick-to-it-ivenessstick-to-it-ive‧ness /stɪk ˈtuː ɪtəvnəs/ noun [uncountable] American English informalCONTINUE/NOT STOP the ability to continue doing something that is difficult or tiring SYN stickability British English