This year the plan was to take my car all the way to Babusar top. In 2009 I made the trip to Babusar in a jeep, but now it is possible to make the same trip in a family sedan. The road is still a dirt track, but it is very wide now and safe. Work is going on at a very fast pace and hopefully we will have a fully carpeted road from Jalkhad to Babusar top in a couple of years.
The track is pretty much plain till Lulusar lake, after that it gets rough and you need to slow down significantly. In some places you need to go at a snails pace to avoid getting the car scraped. But it is possible to reach Babusar top without damaging your car. Tires need to be in good shape. Not recommended for cars with worn tires.
Regarding time, we left Naran at 8:30 am and reached Babusar top at 11:45 am. We left Babusar top at 12:15 pm and reached Naran at 3:30 pm. Some time was also spent at stop overs at Jalkhad and Lulusar lake.