I've been using the solution for one year. 

I've only used the solution for six months. 

I have been using Azure Stream Analytics for more than two years.

I have been using the solution for five years.

I have been using Azure Stream Analytics for six years. We use the latest version. 

I have been using it for a year now. 

I've used the solution for one and a half to two years.

I have used Azure Stream Analytics for the past year and a half.

I have been using this solution for two years. 

I've been using Azure Stream Analytics for about a year and a half.

I have been using Azure Stream Analytics for two and a half years. My company has a partnership with Microsoft.

We have been using this solution for three or four years.

I have been using Azure System Analytics for just more than one year.

I have been using Azure Stream Analytics for approximately three months.

We have been using this solution for approximately 3 years on-premises.

We have been using the solution for two years.

I have been using Azure Stream Analytics for three months.

I have used this solution for a few months.

I've used the solution in the past 12 months.

I've been working with Azure Stream Analytics for about two years.

I've been using this solution for two years.