We have been using Symantec Cyber Security for around three years.  

I've been using the solution for five or six years at this point. It's been a long time.

Although we are no longer using it, we had used the solution for two years.

I have probably got a couple of hundred clients who are using this solution, and some of them have been using Symantec for 10 to 15 years.

I have been working with Symantec Cyber Security Services for about ten years.