Except for requests that are for a commercial use, a DON activity may not charge for the first 2 hours of search time or for the first 100 pages of reproduction. However, a requester may not file multiple requests at the same time, each seeking portions of a document or documents, solely in order to avoid payment of fees. When an activity reasonably believes that a requester or, on rare occasions, a group of requesters acting in concert, is attempting to break a request down into a series of requests for the purpose of avoiding the assessment of fees, the activity may aggregate any such requests and charge accordingly. One element to be considered in determining whether a belief would be reasonable is the time period in which the requests have occurred. For example, it would be reasonable to presume that multiple requests of this type made within a 30-day period had been made to avoid fees. For requests made over a longer period however, such a presumption becomes harder to sustain and activities should have a solid basis for determining that aggregation is warranted in such cases. DON activities are cautioned that before aggregating requests from more than one requester, they must have a concrete basis on which to conclude that the requesters are acting in concert and are acting specifically to avoid payment of fees. In no case may an activity aggregate multiple requests on unrelated subjects.