TCS Offer letter

I have cleared walk in interview on Saturday . Two doubts I have :

1. How many days it take to generate offer letter?
2. Just a month back I was registered on TCSibegin portal by 3rd party recruitment team against their job id for which I did not had any interview or further process , will it create any issues ? I gave the same EP number while attending interview.

Please if any TCS guys/HR help me out here , would be great.