What do shops mean when they are open 7/7?

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When I have been in mainland Europe, in areas such as France or Belgium, a lot of the shops say they're open "7/7".
The latter 7 presumably means 'every day' like in 24/7, but what about the other 7?
Surely it's not uncommon to be open for 7 hours in a day?
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What does 7j 7 mean?
7j/7 {adverb}open all week {adv.} 7. open every day {adv.}Why do many shops and attractions close at midday in France?
In France, travelers have more to adjust to than just jet lag. During your trip, you'll discover dining, shopping, and sightseeing must bend to the French schedule, which sometimes means closing in the middle of the day.iPhone 7 / 7 Plus: How to Fix Black Screen/ Wont Turn On/ Blank Display
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Images: Tim Douglas, Tim Douglas, Amina Filkins, Karolina Grabowska