Overtime fees for Customs services permit custodians to requisition officers on behalf of importers, subject to advance payment. Custodians of ICDs, CFSs, warehouses, airports and ports are included within any person and may requisition Customs officers on overtime on behalf of importers/exporters, subject to advance payment of prescribed fees; fees are payable only for block periods requisitioned and may be apportioned equally by the custodian among all importers/exporters attended during those periods, while individual importers/exporters may continue to request and pay for services themselves under existing practice.