diff --git a/include/chch_ical2mediawiki.php b/include/chch_ical2mediawiki.php
index 7c7f23d..846dd14 100644
--- a/include/chch_ical2mediawiki.php
+++ b/include/chch_ical2mediawiki.php
@@ -1,7 +1,7 @@
 <?php
 $ical_file=$argv[1];
 $backward_seconds=60*60*6;
-$preview_seconds=60*60*24*60;
+$preview_seconds=60*60*24*15;
 ?>
 {| class="wikitable"
 |-