TO CHANGE HOW LONG. FOLLOW THESE STEPS. (go to see inside first) go to (WHEN GREEN FLAG CLICKED) and on the bottom of it, it will say (SET TIMER TO {#}) and you can click the 10, backspace it, and change the number. the number you put in, will be the number of seconds.
updates for holidays. better version https://scratch.mit.edu/projects/780572445/