I have been using Auth0 for one year. We are using the cloud version of the solution.

We have been using this solution for about two months. We are using the latest version. It is currently deployed on private cloud.

I've been using Auth0 for three months.

I've been using Auth0 for approximately three years.

We have been using Auth0 for four or five years.

I've just started using it.

We had been evaluating and testing Auth0 for between three and four months.

I have used it for nine months.

I have been using Auth0 for a year.

I have been using the product for three years. 

We have been using the solution for one month.

I have been using Auth0 for three years.