It takes me 50 minutes to reach Powai from Bandra on my lucky days, and on those days when there is too much traffic, it has taken me more than 2 hours too.
We have direct bus service 422 but I prefer an auto ride.
There are various routes to go to Powai, If you go independently you could choose the route through eastern express highway, through Ghatkopar, through Bandra-Kurla complex, through Goregoan-Powai express highway, through Sahar Airport, and through Andheri-Chakala, I have travelled all the routes and I find the route through Chakala the best route, it passes through Speez and joins the Goregoan-Powai express highway road.
The beauty of the Powai is the lake that runs parallel to motor way and walking by the promenade is a real treat.
Hiranandani Complex is the city by itself just opposite the Powai lake, cleaner and greener than rest of the Mumbai city.