You could add a url parameter for posts per page. Something like this:
$pppage = ( get_query_var( 'posts_per_page' ) == 'all' ) ? -1 : 45;
query_posts( array(
'posts_per_page' => $pppage
) );
then you can set your URL with the parameter posts_per_page=all if you want to show all the posts, if it doesn’t find that parameter it will default to 45 posts. You can rewrite this parameter to something like /all/ to show all.
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