I have been using it for eight months.

I've used the solution for a couple of months, maybe. 

I've been working with the solution for a few years. 

We have been using this solution for five or six years.

I have been using Aqua Security for approximately two years.

I've been using Aqua Security for between two to three years.

I've been using the solution for a year and a half. 

We have been using this solution for over a year. It is a managed service and deployed on cloud.

I've been using it for about three years. I'm using the SaaS version.

I have been using this solution for two years. 

I have been using Aqua Security for about a year now.

I have been using Aqua Security for two years.