Repulse Bay Walk to Stanley? Less than half an hour. Why don't you take the bus? There are many buses, 6/6A/6X/66/73/260/973/ minibus 40 all arrive, and almost all arrive at the destination, and the fares are not expensive.
The ticket price of 973 is relatively expensive ($ 13). If it is not cost-effective to travel from Tsim Sha Tsui, you can take the Star Ferry from Tsim Sha Tsui to central ferry piers (upper 2.2 yuan/lower Kloc-0/.7 yuan), walk to the port government building in Linshi Street, and take 3B(4.3 yuan) to (one stop at Fengpingshan Museum and one stop at HKU Huang Building). Then Stanley goes back to Repulse Bay and takes bus No.6/6x/73. You can get on and off the bus and charge by installments. Much cheaper.