heninng
To change default time interval for Articles Gallery Content Type you will need to edit this file :
/templates/ja_allure/html/layouts/joomla/content/gallery_play.php
and find :
<div id="<?php echo $galleryId; ?>" class="carousel carousel-thumbnail carousel-fade slide" data-ride="carousel"
Add the data interval at the code in this way .
<div id="<?php echo $galleryId; ?>" class="carousel carousel-thumbnail carousel-fade slide" data-ride="carousel" data-interval="1000">
Time is calculated in milliseconds so 1000 = 1 sec ,you can change interval value as per your needs