Final answer:
In Scratch, we can use the say block and the wait block to display a sprite's speech bubble for a specified amount of time.
Step-by-step explanation:
In Scratch, we can display a sprite's speech bubble for a specified amount of time using the say block and the wait block. First, we need to use the say block to make the sprite speak the desired text. Then, we can use the wait block to pause the program for the specified amount of time. Here's an example:
say "Hello!"
wait 2 seconds
say "How are you?"
In this example, the sprite will say "Hello!", wait for 2 seconds, and then say "How are you?".