Here's what people have said about working and interviewing at Primark.
It may be different in other stores but in Primark Bristol the hours are set if I'm honest:
4 to 8 hours, sometimes 12 hours to 16 hours on the weekend
Weekday is either 20 hours or 40 hours subtracting your breaks.
Depends on your age. I am 20 years of age and worked at 2 different stores, one of the stores I was paid £6.49 per hour, whilst the other was £6.86. Unfortunately I am unsure of the other age ranges.