Post your time for any level you got shiny gold in! That way others can have a general idea of how fast the need to be to achieve shiny gold (I don't know why retro chose not to include the necessary time required). Oh, and bragging rights I guess.

Shiny gold in stage 2-1: I got a time of 58.27 for shiny gold (went on to improve it, got 57.12). I am assuming the limit is 59 seconds, as I had another score just above 59 that was plain gold. Limit for plain gold is 1:03.00, so you need to be 4 seconds faster.