[Shedi]

Digging and Digging up to Help Docs of MyBB 1.6 and finally, I found where to fix it,

First go to:- /inc/datahandlers/post.php

The default is 85, just change it to 120 - 160 - 180 whatever you like.

Code:

if($subject_length > 85)
{
// Subject is too long
$this->set_error('subject_too_long', my_strlen($subject));
return false;

None

Change it to :- 160 150 200 Like shown bellow -

Code:

if($subject_length > 160)
{
// Subject is too long
$this->set_error('subject_too_long', my_strlen($subject));
return false;