Limiting Characters in List Module
Design and Skin Customization
jrCore_list is the function that creates lists,
Docs: "{jrCore_list ...... }"
https://www.jamroom.net/the-jamroom-network/documentation/module-developer-guide/89/jrcore-list
The default template is usually called item_list.tpl. so for the blog module it would be found at /modules/jrBlog/templates/item_list.tpl
But may be overridden by a skin template override called jrBlog_item_list.tpl
Docs: "Altering a modules template"
https://www.jamroom.net/the-jamroom-network/documentation/module-developer-guide/1051/altering-a-modules-template
In that will be the variable that outputs the blog text, it will look something like this
{$item.blog_text}
You can find the exact name by using the {debug} function
Docs: "{debug}"
https://www.jamroom.net/the-jamroom-network/documentation/module-developer-guide/1477/debug
Onto the end of that use the smarty function truncate
Smarty Docs: "Truncate"
https://www.smarty.net/docs/en/language.modifier.truncate
So to limit to 200 characters
{$item.blog_text|truncate:200}