The Yahoo Abuse Department does not specify a strict limit on the number of abuse reports an individual can submit. However, it is essential to consider that submitting multiple reports about the same issue may not yield additional attention to your concern. It is generally recommended to provide clear and detailed information in each report, ensuring that the Abuse Department can adequately investigate each unique case you present. If you have genuine concerns about different incidents or users, you are certainly welcome to report them individually. For the most current and specific information regarding the reporting process and any potential limits, it is advisable to consult the official Yahoo webpage associated with their support or help section. This will give you access to the most accurate and up-to-date guidelines pertinent to abuse reporting.