D'Addario EJ64 4-String Dulcimer Strings

Has anyone put these on a baritone uke? curious to see if i could play with a friend from venezuela and use the cuatro tabs.

What is the length of these strings?

Do these work well with DAA tuning?

The 10th string, the .24 B string tuned an octave higher keeps breaking after a few days. Have replaced just that string and it breaks again. Why?