２４ study days for cello

I have never encountered such a text. It is a cello method by Mr. Mario Brunello, a gift from Italy during the stay home period. What surprised me was that the "long tone practice" for the right hand was prepared for 24 days. It's not easy to play the string with a good sound for a long time. The player must always balance own body and cello. I'm convinced that this is an exercise that makes my cello sound better.