Early morning - early evening.
More info at tourismcambodia.com http://www.tourismcambodia.com/travelguides/provinces/phnom-penh/what-to-see/329_orussey-market.htm
Address Street 182 Oknha Tep Phan, Phnompenh, Cambodia
Coordinates 11°33'46.152" N 104°54'59.094" E