If you are heading to city centre from Subang Jaya, it would be a better option to make use of New Pantai Expressway (NPE) as the traffic flow is usually in better control in comparison to *KESAS Hiway, plus the toll rate is lower*. Also, it is not adviseable to get into NKVE hiway and try to compete the morning rush if you really can postpone your journey a bit later than 9am, as you can never tell how bad the traffic was, which you would usually get stuck before Damansara immediately after 730am and another congestion would be the final exit at Duta. If I have an appointment at 9am in the middle of KL, I'd definitely have to make sure that I have passed the Duta exit before 730am which means I'd reach the place much earlier, but I think it should be fine rather than being late!
I managed to clocked a minimum of ten minutes as the traveling period from the first toll booth in Subang Jaya to the final booth in Pantai Dalam, of course the traffic situation along Summit Hotel stretch or the Sunway strecth would be the deciding factor of your earlier journey, as those two places were congested almost at all times, but at least you can roughly estimate the duration of your entire journey.
*Travel Tip: As of January 2011, NPE toll rate RM1.60 per entry, there're 2 toll from Subang Jaya to Pantai Dalam/Bangsar, where as KESAS toll rate would be RM2.20 per toll and there're also 2 toll from Subang Jaya to the last toll at Awan Besar.
