Use the --timeout flag to change the timeout.
--timeout
herbie shell --seed 2019088 (FPCore (n U t l Om U*) :name "Toniolo and Linder, Equation (13)" (sqrt (* (* (* 2 n) U) (- (- t (* 2 (/ (* l l) Om))) (* (* n (pow (/ l Om) 2)) (- U U*))))))