I hope I am interpreting your question correctly. Are you referring to the length of a post excerpt, where it is usually followed by a “read more..” ?
I believe you can add a filter to your themes functions file to customize the length of your excerpts.
Reference: Control Excerpt Length using Filters
You interpreting right ). using this filter? should i instead “new_excerpt_length” put nubmer of words?
Actually, I think if you use this as it is;
function new_excerpt_length($length) {
return 20;
}
add_filter(‘excerpt_length’, ‘new_excerpt_length’);
…and just replace “20” with the number of words you would like to show, I think that will work.
