While his friends are playing computer games, he is busy liaising with suppliers, buying stock and handling orders for his internet marble empire.
The tiny tycoon from London has been running the thriving marbleking.co.uk website for two years, selling anything from tubs of marbles to £599 limited edition Duke of York solitaire tables.
The company is now turning over thousands of pounds each year - with orders flooding in from as far away as America.
Harli is so busy he's even had to employ his mum and two older brothers to help him cope with the sheer demand for products on his website.
But, instead of being overwhelmed, the primary school pupil remains professional and has ambitious plans for the future.
Top of the list is becoming the next Sir Alan Sugar, and like the Apprentice boss, wants to grow his young firm.
Harli said: 'My dream is to have a chain of stores like Hamleys - it will be one of the biggest toy stores in the world but selling all sorts of marbles.
'My friends love that I have my own business. At first some of them didn't believe me - but they do now. They are some of my best customers.'I love marbles and I love having my own marbles company.'
The astute businessman also revealed that the key to success is definitely delegation.
'I like being the boss, but I like to get others to do some of the work so that if something goes wrong it is not all my fault,' Harli said.
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