4. (I) In the case of a facility not owned by the Department, a description of the nature of the contract providing for the detention of aliens at the facility. (J) The average, median, 25th quartile, and 50th quartile number of days that an alien has been detained at the facility during the preceding month. (f) Online detainee locator system The Secretary shall ensure that the online detainee locator system maintained by the Department, or any successor system, is updated not later than 12 hours after an alien is— (1) taken into, or released from, custody by the Department