If you only have a little time I think it´s useful to review the most recently created, commented on or voted on ideas first since those are likely to be fresh in users minds.
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Thank you for your idea. One way to accomplish this is using the "Idea last active" field. If you add this as a column in your report, you will be able to sort on it. This field will be updated whenever the idea is updated in any way -- including votes and comments.