Press release: http://deals.gd/xi8pt
"Kohl’s will be open 24-hours from 7 a.m. Dec. 21 through 6 p.m. Dec. 24 (hours may vary by location) allowing customers to shop when it’s most convenient to them — even if it’s on Christmas Eve!"
Last year they started this 24-hours shopping period on the 20th and in 2015 they started it on the 17th, so it's getting shorter each year.