To set the time in the geometry dash scratch game you should use a variable to keep track of the elapsed time. Create a variable called "Time" and set it to 0 at the start of the game. In the main loop of the game, add a block to increase the "Time" variable by a small amount (like 0.1) after each frame. This can be done using the "variable change" block in Scratch. Adjust the Game Pace based on whether the player has survived for a specific amount of time or if they should be rewarded for their performance based on time.