Why are my new rim brakes worn so much? Got these on 17 days ago and probably done no more than 60 miles. The main commute is 6 miles. 4 of that is a steep downhill.
Looking at the design of the brake pads, this appears to be a cheap generic pad that is then re-branded (in different colours) by various manufacturers.

Reviews seem to be mixed, with reports of the pad wearing quickly, but other reports of the pad lasting forever and wearing the rims out quickly.

I'd suggest that when it comes to brake pads, this is an area not to look for cheap replacements.  Either use the brake manufacturers own pads, or ones from well respected third parties such as SwissStop or Kool Stop.