I've been working with IBM Cloud for 8 years since Bluemix was announced. At that time I was an software architect in IBM and primarily used it for experimenting. Now I have a startup and am using it fulltime since 3 years. 

We have been using this cloud solution for about eight months.

I have been using IBM Public Cloud for a year and a half. My company has a partnership with IBM.

We have been using this IBM product for four or five years.  

We are IBM partners, so we've been using IBM Public Cloud for the last two years, and we're still using it.

We have been using this solution for more than four years.

We have been using IBM Cloud for a few years.

I've been using the solution for about a year now. It hasn't been that long. 

I have been using IBM Cloud for six years. 

I have been using this solution for two months.