Timing starts the moment you start moving any of the pieces on the board. Once the countdown finishes, you can start moving the pieces. If a trophy is required to know when to finish, make sure to remove it from your profile.
Streaming is not required, but for larger races, it may get enforced. All Versions of the game (Original and it's special editions) must use the unmodified files (i.e. modifying alpha files, removing files are not allowed) which involve Classic Chuzzle or Speed Chuzzle.
Reach the respective score threshold (going over is OK). Your final time is the first frame of the score threshold passed.
All Trophy-related Races
As Classic, Speed Chuzzle, Mind Bender or any other miscellaneous trophy races, in which the goal is to fulfill the requirement of unlocking the trophy. Your final time is when the screen flashes to indicate that you got the trophy.
A Fresh Profile is required for this run. Unlock the secret gamemode by selecting the 4 required trophies in sequence. Your final time is when the last trophy in the unlock sequence has fully zoomed in with the text saying Bechuzzed is unlocked.
As this mode has no in-game methods to reset back to zero. You'll either need to make a new profile or remove your existing one. The Goal is to fill enough bottles to earn the respective charm. Your final time is the first frame the charm appears.