10 days is 2 weeks.
I had 1-2 weeks off school most years growing up for a family holiday.
Dad had factory shutdown which was always term time, so it was a holiday then or not at all. We never went abroad, it was just uk based holidays often in a caravan or small cottage by the sea, sometimes camping.
All three of us grew up still valuing education. We all got good exam results, all got good degrees and all have professional jobs. I work in education, so value school education a great deal.
But for the average child a two week family holiday, even in term time, isn't going to be damaging to their education. We rarely missed school for any other reason and were fortunate enough to be well and healthy as children.