y e a r s = − A W C ∗ e ( − β ∗ A v g ( j ) ) ( β + r ) 2 ∗ ( e ( − ( β + r ) ∗ ( S t d L E ( j ) ) ) ∗ ( 1 + ( β + r ) ∗ S t d L E ) − ( 1 + ( β + r ) ∗ A v g ( j ) ) ) {\displaystyle years={\frac {-AWC*e^{(-\beta *Avg(j))}}{(\beta +r)^{2}}}*(e^{(-(\beta +r)*(StdLE(j)))*(1+(\beta +r)*StdLE)-(1+(\beta +r)*Avg(j))})}
