I have been using this solution for the past 30 years. 

I used this solution for three years, up until a couple of months ago when I moved to a different company. 

I have been using the solution for over 20 years.

I use the solution currently.

I have used it for five to six years, primarily for community, enterprise, and solution projects. I am using the latest version.

I have been using Visual Studio Test Professional for a few years.

I have been using Visual Studio Test Professional for some time. 

I have been using the solution for 10 to 15 years.

We have been using this solution for almost a year.

I have used the solution for a month or two.

We have been using this solution for four years. It is deployed on-premises and on Azure cloud.

I've been using Visual Studio Test Professional for as long as I can remember.

I have been using Visual Studio Test Professional since the mid-eighties.

I have been using Visual Studio Test Professional for ten years.

I have been using the solution for more than four years.

I have been using this solution for four or five years. 

We have been using Visual Studio Test Professional for more than twenty years.

I have been using Visual Studio Test Professional for ten years.

I have been using the solution for five years.

I have been using this solution for two years.

We've been using this solution for several years and have used Visual Studio 10, 12 and 13. We use it both as a cloud solution and on-premises.

I've used the solution for a very long time. I've used it since version 1.5. It's been many years.

I have been using the solution for two years.

We have used Visual Studio for as long as I can remember. It has been about 10 years.

.

We have been selling Visual Studio for more than 10 years.

I have been using Visual Studio Test Professional for approximately four years.

I have been using this solution for five years. 

I have worked for different organizations and have been using Visual Studio Test Professional since 2010.

I have been using the solution for approximately 15 years.

I have been using this solution for about six years, since 2014.

I have been using Visual Studio Test Professional for two years.

I've been using this solution for five years. 

I have been using this solution for four years.

I've been using the solution for 20 years. 

I have been using the solution for years.

I have been using Visual Studio Test Professional for 18 years now.

I've used it for six years.

I have been using Visual Studio Test Professional for about eight years.

Around two years.