Auto Filter Limits

Auto Filter Limits

Is there a limit to the number of items that will appear in an auto filter drop down box.

I have an auto filter set up on one of my views but it is missing the most recent items that I would expect to see at the bottom of the list.

If there is a limit to the number of items that will appear, and if so how to I restrict the list to show say the most recent x number of items.

Thanks.