Question: how to change length of snapchat timer?
Answer: Log in to Snapchat.
Tap the larger, open circle at the bottom center of the screen to snap a photo. ... 
Tap the “Timer” icon in the lower-left corner of the screen.
Scroll through the selections, choosing a time between 1 and 10 seconds. ... 
Your chosen duration will appear in the center of the timer icon.