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Hello @sherry22
Thank you for showing interest in our plugin. The free edition of the plugin is completely free as it is. There are no time or user limitations. With it you can build a solid 2FA system.
With the Premium edition you get more 2FA methods and automation, however, the free works well for many websites and once set up you can keep on using it as it is since there are no time limitations.
I hope the above answers your email. Should you have any further questions, please do not hesitate to ask.
Have a great day.