SNOO often calms fussing within 40-60 seconds. So, if fussing stops quickly as SNOO increases the motion/sound, your baby just needed a little more soothing and is not very hungry.
However, if the crying is continuing for more than a minute, it usually means your baby needs some help…a feeding, a diaper change, a hug etc.
You definitely do not need to wait for the bed to “time out” and stop itself. Trust your instincts!