Note: I splitted approximately 2 seconds early on the final blow, so the final time was 20:56.
I missed the red rupee which made me take a longer detour to the shop, and I missed jumping to the ladder in Kakariko which cost me around 8 seconds. Unbuffered void-warp HESS, but I failed buffering WAY too many times when switching to left ESS. Much room for improvement.