We have been using Red Hat Ceph Storage for four years.

I have been using Red Hat Ceph Storage for the past five to six years.

I have been using the solution for about five years.

I'm just a new hire in the company, however, we have been exploring Ceph Storage for two years.

I have been using Red Hat Ceph Storage for three years.

The company has been using this solution for the past five years, I've been using it for 12 months. 

I have been using the product for more than two years. 

I have been using this solution for ten years. 

I've been working with this solution for approximately five years.

I've been using the solution for six months.