I imagine that quite a lot of journalists, especially in broadcasting, don't work 9-5, especially now that it's the era of 24/7 news.
I tried to find a Sky TV job advert to see if there's any info on working hours, and couldn't find one, but found this ad for a radio journalist at Sky that says the hours are 45 a week and that the person would be expected to "Work a shift pattern which includes weekends and overnights."
sky.talent-community.com/projects/radio-...t-12-month-ftc/40810