.htaccess max_execution_time I want to change the max_execution_time in the .htaccess file. I tried it in this way: &lt;IfModule mod_php5.c&gt; php_value max_execution_time 300 &lt;/IfModule&gt; but then I got a 500 internal server error. 
My .htaccess file also includes this: 

&lt;IfModule mod_rewrite.c&gt;
    RewriteEngine On

    # Send would-be 404 requests to Craft
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_URI} !^/(favicon\.ico|apple-touch-icon.*\.png)$ [NC]
    RewriteRule (.+) index.php?p=$1 [QSA,L]
&lt;/IfModule&gt;


Any idea why I got this error? Or how I can change the max_execution_time in an other way?

(I sadly do not have the possibility to change the php.ini)
You can alter the index.php file and add [set_time_limit][1](300); anywhere below the &lt;?php tag. 

You can also try to set it by ini_set('max_execution_time', 300);

For the reason why it returns a 500 Internal Server Error, the server does not support the php_value and php_flag parameters through the htaccess file or it doesnt use the php5 module. You can try setting the php_value directly and check again for errors, or contact your hosting provider for support