An ion-exchange column containing 99.3 g of amberlite ion-exchange resin was used to remove Cu²⁺ from a solution where Co = 0.18 M CuSO₄. The tower height = 30.5 cm and the diameter = 2.59 cm. The flow rate was 1.37 ml solutions/s to the tower. The breakthrough data are shown below.

t(s) I c(gmol Cu/L)

420 I 0

474 I 0.0028

507 I 0.0089

540 I 0.0157

600 I 0.0527

660 I 0.1063

720 I 0.1433

780 I 0.1634

810 I 0.1722

870 I 0.1763

917 I 0.180

The concentration desired at the break point is C/Co = 0.020. Determine the total capacity of the column in seconds. Answer in whole number.