How long the call lasted, as a person would say it: "Under a minute", "12 min", "1 hr 5 min".
Measured from the session row's start and close when the lookup supplied them, since the
transcript runs from the first thing said to the last and so comes up short. Otherwise it falls
back to the transcript's own span.
null while the call is still going (Active or Idle), and whenever there is no span to measure.
A single caption says nothing about how long a call ran, so it gets no duration rather than a
confident "Under a minute".
How long the call lasted, as a person would say it: "Under a minute", "12 min", "1 hr 5 min".
Measured from the session row's start and close when the lookup supplied them, since the transcript runs from the first thing said to the last and so comes up short. Otherwise it falls back to the transcript's own span.
nullwhile the call is still going (Active or Idle), and whenever there is no span to measure. A single caption says nothing about how long a call ran, so it gets no duration rather than a confident "Under a minute".