Would like to share my recent experience of the to and fro Kolkata-Siliguri experience where I used both the routes. Hope the update helps everyone to plan their travel accordingly.
Update 25/05/2016 : Kolkata to Siliguri Via NH-34 all throughout
My Kolkata Residence (02:40am ) to Dhuliyan (07:40am) - 290 Kms covered in 5 Hours via Ranaghat-Krishnanagar-Plassey-Sargachi-Moregram
Took a 40 Minutes break at Dhuliyan for Breakfast
Dhuliyan (08:20am) to Raigunj (11:20am) - 130 Kms covered in 3 Hours Via Farakka-Malda-Gazole including getting stuck for around 45 minutes in a Dead Lock Traffic at Kaliachawk. However, Farakka was a breeze
Took a 10 Minutes break at Raigunj for some Tea
Raigunj (11:30am) to Islampur (01:30pm) - 88Kms covered in 2 Hours Via Botolbari-Dhantola
Took a 1 Hour 15 Minutes break at a relative's place
Islampur (02:45pm) to my Hotel @ City Centre, Siliguri (4:00pm) - 75 Kms covered in 1 Hour 15 Mins
Total Kms covered - 583 Kms with a
Driving Time of 11 Hours 15 Minutes including being stuck in Traffic @ Kaliachawk for 45 Minutes. So
effectively 10 Hours 30 Minutes of Driving
Overall a decent experience. However, the road upto Krishnanagar from Kolkata is not in the best of shapes and can eat up a lot of time in traffic situations. It did not effect us as we had left post midnight and the traffic was pretty thin that time.
Update 30/05/2016 : Siliguri to Kolkata Via Bhagalpur-Deoghar-Dumka-Siuri-Guskhara-Burdwan
Our Hotel @ Siliguri (06:30am) to Bhagalpur (10:10am) - 261 Kms covered in 3 Hours 45 Mins Via Dalkhola-Purnea-Naugachia-Vikramshila Setu
Took a hour's break at Bhagalpur
Bhagalpur (11:10am) to Khatoria (01:00pm) - 80 Kms covered in 1 Hour 50 Mins Via Amarpur-Banka including around 40 minutes taken to cross the town of Bhagalpur
Took a Tea break of 20 Minutes in Khatoria
Katoria (01:20pm) to Dumka (03:10pm) - around 100 Kms covered in 1 Hour 50 Mins Via Deoghar
Dumka (03:10pm) to Siuri (04:15pm) - 70 Kms covered in 1 Hour 5 Mins Via Masanjor
Took a 15 Minutes break at Siuri for Tea again
Siuri (04:30pm) to Shaktigarh (06:45pm) - 102 Kms covered in 2 Hours 15 Mins Via Purandarpur-Parui-Bhedia-Guskhara including 25 Mins being stuck in traffic at the Talit Level Crossing and thereafter taking a detour from some village road to connect on to NH-2B. Note : The traffic at the Guskhara underpass was not moving, thus took the inner road through the parallel culvert
Took a good 45 Minutes break at Shaktigarh for Tea & Snacks
Shaktigarh (07:30pm) to Dankuni Toll Plaza (08:30pm) - 72 Kms covered in an hour's time
Total Kms covered - 685 Kms with a
Driving Time of 11 Hours 45 Minutes including being stuck in Traffic @ Bhagalpur for 40 Minutes and at Talit for 25 Minutes. So
effectively 10 Hours 40 Minutes of Driving
But, the horror story for me was the road from Dankuni to my Residence which took me 1 Hour 30 minutes to cover a mere 30 Kms thanks to the Traffic at Dankuni, Kona Expressway, Satragachhi, AJC Bose Road Flyover and at Park Circus
Overall, the road all throughout in this stretch is in a brilliant condition as of now and that fresh carpeting is further being done on this route. Highly recommended !! The direct road from Bhagalpur to Dumka still is supposed to be in tatters and as per the locals the craters have till now not been filled/ repaired.
Sharing some snaps of the road on the Siliguri-Bhagalpur-Deoghar-Dumka-Siuri Route for everyone's reference.
From Naugachia to Bhagalpur :
The Vikramshila Setu :
Road between Bhagalpur to Khatoria :
From Khatoria to Dumka :
From Dumka to Siuri :
Would recommend this route as of now considering the unpredictable nature of NH-34 which was apparently immovable for consecutively 3 days between Dhuliyan to Maldah as per the locals and some fellow travelers because of which I opted to take the Bhagalpur Route for the first time and it turned out to be in my favour. A big vote of thanks to BHPian Samba for notifying me at the correct time to avoid the NH-34 route which had the said bottleneck.