$8$
32. The Golden Merry ship sails from Port A to Port B via Port C. The journey from Port A to Port C is against the current, and from Port C to Port B is with the current. The distance from Port A to Port C is $\frac{2}{3}$ of the distance from Port C to Port B. The ship's speed against the current is half of its speed with the current. The ship takes a total of 7 hours to sail from Port A to Port B via Port C. The ship will take $\qquad$ hours to sail from Port B to Port A via Port C.