Would it be a great idea if i start to work as a vetenarian nurse as a full time job and still ride my horses in the holidays?

Your horse will have a lot of bottled up energy and might be a hand full when you ride him only during holidays. Good luck with your work. I also work full time as an IT specialist but makes time for my horse every week.
As long as your horse gets enough movement (gets ridden by someone else 3 to 7 times a week and goes out on the fields every day) yes.
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