The limit is FEFFFFFF-800 (hex) or FEFFF7FF (4,278,188,031) records as the highest are reserved for temporary references (FF) and the lowest 800 are hardcoded and cannot have an index higher than 00. That is across 255 plugins. Per plugin the limit is FFFFFF-800 or FFF7FF records. That's 16775167 records, you will never ever use 16 and a half million records in a single plugin most likely and if you do, you're doing it wrong. Not that MMX will ever see this information, but someone else can quote me.