Estimating time in a project that includes unfamiliar concepts?

Question

In providing a time estimate for a project that includes work in areas, you have no experience in how you evaluate?

In most cases, it is difficult to get an estimate correctly when the areas of the project are familiar.

What methods did you use in these cases? How well did they work?

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"I don’t know how long it will take us to get an expert to give us an assessment. I’ll talk to my colleagues and give you an assessment on Friday of how much time it will take to get an expert assessment."

This can be combined with large error fields that are rapidly decreasing. “It will take 1 year, +/- 9 months. I will give you another estimate with a range of errors +/- 3 months by June 30.”