I saw a guy wearing one, and he had his at about shoulder height, id assume as long as u can get that piece to your mouth you are good to go.
I would start riding in deep stuff with that already in my mouth...
2015/16 -17- Kirkwood days
Arbor A-Frame 158 2009-10
Jeremy Jones Hovercraft 156, 2011/12
Subaru WRX 06 - 181K