"You know, Lisa, for the longest time, did not sing"

In this quote, Priscilla Presley is reviewing her buddy Lisa's past and how she used to not sing. Using "for the longest time" recommends that Lisa's absence of singing was a substantial part of her life for a substantial quantity of time. This could suggest that Lisa was hesitant or scared to sing, or perhaps she did not have the self-confidence to do so. Priscilla's declaration also suggests that Lisa has actually since overcome this obstacle and now sings, potentially indicating personal growth and development. Overall, the quote highlights the evolution of Lisa's journey and the positive change that has actually occurred.