We have been using WhatsUp Gold for eight years. 

I have been working with WhatsUp Gold for seven to eight years now.

I've been using the solution for seven to eight years. 

I have been using WhatsUp Gold for approximately 10 years.

I have been using WhatsUp Gold for approximately six years.

We've been using the solution for 20 years.

We have used this solution for more than five years. 

I have been using WhatsUp Gold for the last year.

We are using version 19.2.0.

I've been dealing with it for 22 years.

Since 2015.

I've been working with this solution for more than three years.

The company that I work for has been using WhatsUp Gold quite a lot more for the past few years but they have had it as a solution for the past 10 years. I have only been in the company for about six or seven months.  

Over two and a half years.