Ill. Admin. Code tit. 2, § 1201.420 – Recurrent Requesters

a) Notwithstanding any provision of this Part to the contrary, the Agency will respond to a request from a recurrent requester, as defined in Section 1201.102, within 21 business days after receipt. The response shall:
1. 1) provide to the requester an estimate of the time required by the Agency to provide the records requested and an estimate of the fees to be charged, which the Agency may require the person to pay in full before copying the requested documents;
2. 2) deny the request pursuant to one or more of the exemptions set out in this Part;
3. 3) notify the requester that the request is unduly burdensome and extend an opportunity to the requester to attempt to reduce the request to manageable proportions; or
4) provide the records requested.
b) Within 5 business days after receiving a request from a recurrent requester, the Agency will notify the requestor that the Agency is treating the request as a recurrent request, of the reasons why the Agency is treating the request as a recurrent request, and that the Agency will send an initial response within 21 business days after receipt in accordance with subsection (a). The Agency will also notify the requester of the proposed responses that can be asserted pursuant to subsection (a).
c) Unless the records are exempt from disclosure, the Agency will comply with a request within a reasonable period considering the size and complexity of the request. (Section 3.2 of FOIA)