Trending @Cognizant; How many days can we stay in ADP and then we will be shifted to the PDP bench? And After that how many days can we stay on the PDP bench?

I am currently in ADP bench. After that I'll be on the PDP bench, right? And if the ageing period is started and we resign. Do we get severance pay?

I have heard that if we are unassigned for more than 50days then HR will ask to resign with severance pay of 4months at 55th day