The Legend of Zelda: Four Swords rules

Note: 2 players is ideal for completing a speedrun quickly

The Legend of Zelda: A Link to the Past & Four Swords on the GBA

Any%
Timing begins when Player 1 presses the A button after all players link up
Timing ends at the final hit on Vaati (phase 2 with the cosmic background, not the fake blue warps after phase 1)
Timing for splits is when Link receives a key from the fairy

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The Legend of Zelda: Four Swords Anniversary Edition on the DSi

Any%
Timing begins after selecting the color of the second link (single player) or when both players are ready and press A (multiplayer)
Timing ends at the final hit on Vaati (phase 2 with the cosmic background, not the fake blue warps after phase 1)
Timing for splits is when Link receives a key from the fairy
Note: Final game time is simply the sum of the times for each stage (12 total)

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Individual Level runs (namely Realm of Memories and Hero's Trials)

Timing begins when the level is selected (stage 1 of 3)
Timing ends when both Links are in the blue warps and begin spinning around at the end of the 3rd stage (when the game timer on the bottom screen stops ticking)
Timing for splits is at the end of the stage (stage 1 or stage 2) when both Links are in the blue warps and spin around
Note: Game time is simply the sum of the times for each stage (3 total)