Would like to enroll but don't know whether I could finish it in one and half hours.
You can finish it in 2 hours. Noone care ! In fact, no result marked on the cert. But one swimmer died last year. Make sure you are ready before joining the game. Swimming is much more dangerous than running.
Thanks for the advice. I swam 3.0K (60 swimming pools) in almost two hours last sunday and try my best to swim a bit faster.
It should be OK lah. Nobody care during the race ! But 2 mins per lap need to improve. You may hire a coach that can help. No one clock the result except you are top 3 can finish around 30mins.