Unfortunately theme doesn’t have such option, you have to change source code manually. Modification below is described on Directory+ Theme.
In order to change lenght of displayed text on Category or Location pages, edit file ./wp-content/themes/directory2/portal/parts/item-container.php
and look for following part of code:
{!$post->excerpt|striptags|trim|truncate: 250}
Change truncate parameter to another number of displayed characters.
In order to change length of text on Search Results page, do the same change in theme file ./parts/post-content.php
Modification in our other directory type themes is basically the same, just some small differences in code may appear.
Please do not submit multiple tickets for the same request, as this does not result in a faster response time.