This is actually worse than I thought. We currently cheat in the crontab to dispatch 2 imports per machine per minute. We currently have three machines, so this means we can dispatch 8640 imports per day. We currently have 1654 imports regularly being updated. Assuming that they are all updated 4 times a day (not really true, but not so far off either) we have to dispatch 6616 imports a day -- not very far away from the hard limit!