Translation of tuba

No, it is a summer camp for teenagers between the age of 16 to 18. They spend 9-10 months of the year in the boarding school, first in the mountains, then near a sea in the local area. Some of them have work to do during the summer vacation.
I think I have told you that I won't charge you for this kind of help. I looked at the sentences and I found them a little too long. They were good, but I understand why it took you so long and I think the point is too keep the shorter.
Thank you for your kind message. I have not done anything for my Spanish because I have too much work at my job. I might write you a letter, but I'm so busy at work that I can't afford other hobbies.