I am pretty sure I saw time elapse off the clock during a 2pt conversion try. The extra point play and two point try after touchdowns are untimed plays
ha - I noticed in one of my games that the team I was playing failed to score a 2 pt conversion and then burned a timeout. It helped my team so I'm not upset in the least but I thought that should not require a timeout since the next play is a kickoff.
Link to the 2 point attempt...you can see next play is a timeout: