Yes, I'd expect it to be close to 10 minutes, but do not waffle on. What are the questions? I suspect people can give you some guidance.
Generally, I'd give really concrete examples to illustrate your reasoning and elaborate on the points you've made. So for example, would this particular computer system be appropriate for implementation in this context? Why or why not? (I'm just pulling this out of thin air)
You said whether it would or would not. Then you cite your reasons for why to back up your answer.
Because it works best in this type of environment - demonstrate why, explain case study you've found to show this
Because it's cost effective - discuss evidence of cost effectiveness and how this evidence is applicable to this particular scenario you've been given
Because it will make it possible for the company to reach stated goals - what are these? how will it help? Give an example.
You can provide an illustration of how your recommendation would work in the context of whatever role you are applying for.
And you may want to consider limitations or alternatives. Think about how someone on the interview panel would disagree with your recommendation and come up with evidence for how you would rebut this, or what limitations of your proposed solution (or whatever) might be worth mentioning.
Basically, it's about providing evidence, examples, elaboration on your answer.