Prayers while traveling between multiple destinations

I am traveling in the following sequence, is qasr applicable? I live in city A. I travel for 2 days and reach city B. I stay in B for 2 days. I travel for more than 1 day and reach city C. I stay in C for 15 days. I travel for 2 days back to A. Distance between A & B and B & C and A & C is a few hundred miles. I am away from home for a 100s of miles during the whole journey. I am not returning to my home A at any point during the journey.