All of our FTP Hosting packages allow for unlimited connections per username/password at one time. This means you can give the username/password out to hundreds or thousands of people and they can all log in at the same time to upload and/or download files from your FTP site.
Your customers, clients and employees will be able to access the FTP site 24x7x365 on their schedule and will never be limited.
Note: As the FTP Hosting Administrator you can limit permissions like read, write, create, etc on a per username basis. Depending on your business and the files your sharing these might be options you will need to configure to ensure files are only downloadable and cannot be modified on the FTP server.