Energy simulation taking too long

I am simulating a 10 floor simple cuboid building. The size of one floor is 230 square meter with 3 m height. when I simulated for energy requirements it took 5 min. But then I added horizontal shading on all windows and ran the simulation again. However, this time it is taking too long to run(more than 10 hours). The only difference between the 2 simulations was the addition of horizontal shading.

Kindly help if there is any way I can reduce the timing .