very bad managed they call for interview and say interviewer's cell fone is not reachable so it is cancelled. I travelled 30 kms for this. They could not arrange any other interviewer to to take the interview.

Interview process was good and yes it was a time consuming process. So you have to be available for whole day. You need to be technically good and should show the confidence that yes you can achieve the target. After interview it really depends on your luck and the urgency of the company to get the offer letter. It varies from 2 days to 7 months.