Can You Have A Passenger Stop Duration Shorter Than 35 Seconds?

For some reason it isn't letting me do this.

 

Unfortunately the minimum stop time is 35 seconds for a passenger stop with the doors opening

 

If you are using an AP or similar train that operates as Driver Only, you can always replace the Pick up passengers with a Stop at Destination instead. That way you can reduce the stop time but still open the doors and close them in time.