Maximum execution time of 30 seconds exceeded

[toff]

YaBB SE Version: 1.5.4
PHP Version:
MySQL Version:
Server Platform: Unix, Linux, or BSD
Link to Forum:

Problem Description:
Hello,

Afflicted for my English...
I use yabb v1.54Se and I have a thread with a significant number of reply (64 pages).  
When I go on the last page of the reply of this thread, I have this message:  

Fatal error: Maximum execution time of 30 seconds exceeded in /home/cheztoff/public_html/forum/Sources/Subs.php on line 949

http://www.cheztoff.com/forum/index.php?board=11;action=display;threadid=703;start=945

There is perhaps too many reply for this post?  
If somebody with an explanation, I am taking.  
Thank you in advance

[Ben_S]

Do you have any image size restrictions set in installed mods and settings?

YSE can easilly cope with thousands of replies to a th read.

[toff]

Not I do not have any restriction on this level in my configuration yabb.  

I tried to erase the 5 or the 6 last reply and now, the subject does not appear any more in the forum.  I can only reach the subject using the direct bond:  
http://www.cheztoff.com/forum/index.php?board=11;action=display;threadid=703;start=945

When I tests to make a reply in this subject, nothing appears in the thread..