drupal cron problems-cron taking too long

"Cron has been running for more than an hour and is most likely stuck". Try resetting the semaphore and deleting the "last run" timestamp from the database. (Note: deleting the "last run" timestamp will cause your Status report to indicate that cron has never run.) You can do so with this SQL...

USE Name_Of_Your_Drupal_Database;
DELETE FROM variable WHERE name="cron_semaphore";
DELETE FROM variable WHERE name="cron_last";

...or with this PHP in a custom module or script:

<?php
variable_del('cron_semaphore');
variable_del('cron_last');
?>

... or with drush:

drush vdel cron_semaphore
drush vdel cron_last

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