There's a right and wrong to do this.

Some of my worst interview memories are from a company where the VP leading hiring had ideas that candidates needed to be made to feel as comfortable and positive as possible and treated equally, including giving them the same interview length after they got past the screener.

The screener mostly filtered out unqualified candidates, but when someone slipped through and then was obviously not going to make it through the interview we all had to pretend that they were doing a great job and keep pushing through anyway. There was lots of fake encouragement that most candidates could see right through. Really painful for everyone to have to sit through interview sessions when everyone in the room, including the candidate, knows it's not going to work out.