i found the solution here: https://groups.google.com/group/anthologize-users
which is:
Add the following two lines in the Anthologize code by looking for the base.php file within the templates folder you are exporting. E.g., for PDF, /wp-content/plugins/anthologize/templates/pdf:
ini_set(‘max_execution_time’, 600);
ini_set(‘memory_limit’, ‘128M’);
That worked for me. Only problem left now is that all images which were icons in the blog articles are now not in rows and columns but in one row for each single icon which makes 550 pages instead of maybe 100…