2 Round of technical interview, followed by HR round In the HR round I got know there are three more rounds of interview with Client. it was not told earlier. And until you clear the client round interview , wont get offer letter

I was called in at 12 O' Clock but after reaching the venue I came to know that there is a long queue and I need to wait for my turn to come. My interview actually conducted @ 5 PM...it was too much of waiting time. Two technical rounds were conducted followed by HR round and I was @ the venue till 7 PM.