Hi there! It is much more time consuming than I have ever imagined to operate a store in my personal experience.
It's a ton of research, development, money and time in the beginning, and by beginning I mean years, lol. I'm in my second year of making clothes and it's still a learning experience everyday.
I probably would say I put more time into it than a full time job because I spend additional time promoting and marketing, coming up with new products, ect and that is all unpaid of course.
Now, I absolutely adore what I do and wouldn't have it any other way, but it is so much more complex than I ever could have imagined.
But as with anything, it's all what you make of it and it could be as busy or as slow as you want it depending on the amount of work you put into it
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I wish you a lot of luck and success if you decide to pursue it!