### 19.2 Average durations ¶

If parameter `Duration_Method` is set to `Averages` then segmental durations are set to their averages. The variable `phoneme_durations` should be an a-list of phones and averages in seconds. The file `lib/mrpa_durs.scm` has an example for the mrpa phoneset.

If a segment is found that does not appear in the list a default duration of 0.1 seconds is assigned, and a warning message generated.