Not true for KLCC part. KL south yes (e.g. Balakong, Kajang area).
BSC to KLCC is only 38km ish.
And you can reach in 1 hour using Jln Kuala Selangor to DUKE.
Had an exhibition some months ago in KLCC, took me exactly 1 hour from BSC until I reach KLCC parking (parked my car too). Started at 8AM.
The next day, took the same route but it rained in the morning.
Stuck in front of Bdr Sri Damansara before going up DUKE; total also 1 hour 15 mins only.
For me, it is reasonable for the distance and the amount of small roads (esp. Jln Kuala Selangor) that we need to go through before reach DUKE.
Apple to apple wise, considering Klang to KLCC is about the same distance.
But doubt can reach in 1 hour.
problem that there are more and more cars going to flood the roads haha.... new projects completion coming soon... and more road users coming from those new projects... but still... 1 hour to KLCC still achievable during peak hour... can use LATAR to DUKE also if wan faster route just need to pay alot more...