6:30 hrs from Kochi to Krishnagiri??? IMHO, you may want to recheck your plan; I'm not saying its not doable, but feel it should take more time under good driving speeds.
Regarding Krishnagiri-Vellore distance you've the answer from ampere.
I'm doing Bangalore-Kochi frequently for the last 7-8 years. It was about 9 hrs when the highway was not in shape but with recent road conditions and with an off peak hour start, you can do Bangalore(Silkboard)-Kochi/Kochi-Bangalore in 8hrs without risking anyone.
I assumed about 1.30 hrs for Bangalore-Krishnagiri thats how this 6.30hrs came in!!
Krishnagiri to Poonamallee (Chennai outskirts) can be comfortably done in about three and fifteen minutes add another hour to reach Mount Road from Poonamallee since you would be doing that stretch during afternoon time.
In the middle of the night I have done A2B (Krishnagiri) to Koyambedu in about 3 hours which was certainly crazy driving in my opinion. But I have done Padi - Krishnagiri umpteen number of times in three and a half hours with a sedate driving of around 90 kmph. So if you plan to reach Krishnagiri around 10.30 you should be able to reach Mount Road around 2:30 / 3:00 PM
@coolclouds - sorry that I couldn't get my toll fare to show you some good solid timing, I think I've lost them; Ok, keep aside some time for food breaks too, hope you're travelling with your family, have a safe trip & welcome to Chennai.
Both my journeys were along the same route. When returning, i had stayed over at my relative's place in Kumily, and so started the journey from Kumily at 0530 hours, and reached Electronics City phase 2 at 1430 hours. This ofcourse included 2 food breaks, one photography break and and one tea break. I usually stick to the 100-110 kmph mark.
Thanks. That means approximately 12 hours for the trip from Bangalore to Kottayam with a couple of stops of half hour each. Doesn't seem to be different from the regular route through NH47.
Does anyone know the current condition of the road from bandipur till Nilambur ?. The last I heard was about the repair work happening
I went through it 3 months back. It was very nice but for a small at the Nadugani Ghat section between Gudalur and Nilambur. Apart from that it was beauty with twisty roads and quite comfortable to drive.