Kill Statistics are updated once a day at 4 am CET/CEST or 6 hours before Server Save. When the website is updated, it counts creatures killed up to the update. For example: If you kill a midnight panther at 3:30 am CET/CEST, it will appear on the update, but if you kill it at 4:10 it will only appear on the next day's update, 23h50 min later. This may not be exact to the final minutes because the scripts probably take some time to run, update the website, etc, but it's close. So a rough estimate will be 4 am - 4 am.
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