From my experience in projects the number of real subject matter EXPERTS is usually limited to a handful, so a typical number would be somewhere between 3 to maximum 10. It depends on how you set the criteria for someone to call her/him an expert.
On the other hand, we often involve all stakeholders of a project, not just the experts, in order to achieve group consensus. The stakeholders' involvement gives them the feeling of importance and own contribution, which makes the final acceptance of the out coming priorities much easier.
In those cases you still can use the weighted geometric mean for the aggregation of individual judgments, and give the experts of the group a higher weight than the other stakeholders. Then, of course, the number of participants can easily go up to 20 or even more.
There is no specific rule but your results would be more acceptable if you met an appropriate size of experts like a range of 10-25.
There is no hard and fast rules. It depends upon the number of factors considered in the problem. At least number of experts must be equal to number of factors.
I think, there is no rule for appropriate number of experts in AHP. It depends on specialized expertise.
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