Use the --timeout flag to change the timeout.
herbie shell --seed 2020322
(FPCore (n U t l Om U*)
:name "Toniolo and Linder, Equation (13)"
:precision binary64
(sqrt (* (* (* 2.0 n) U) (- (- t (* 2.0 (/ (* l l) Om))) (* (* n (pow (/ l Om) 2.0)) (- U U*))))))