authorized user limit - standard plan

Is there a limit to the number of emails you can invite as authorized users on a private application on the standard plan on I'm working with several R Markdown reports with shiny prerendered runtime and want to know if I'll have trouble scaling this reporting structure in the future. I couldn't find anything about a limit to the number of users in the documentation, plan descriptions, or elsewhere online, so I assume there isn't one but I want to be sure.