The division, which provides police checks and other services, will open from 7.30am to 4.30pm instead of 8.30am to 3.30pm, said RTP spokeswoman Napawan Panya on Friday.
The offices will still be closed on weekends and national holidays.
People can check online whether a person has a police record by filling in the form at https://www.crd-check.com/.
Those who wish to check criminal records using fingerprints must make an appointment to visit the Bangkok head office or a provincial office at http://www.crdqonline.com/.
Napawan added that the head office on Henri Dunant Road has prepared a waiting room at Building No 12 to reduce crowding. From November 7, the waiting room will open from 7am.