In the sign-up form they state that "Note that each audio request is limited to 2 minutes in length." Does anyone know what "audio request" is? Does it mean tha

In the sign-up form they state that "Note that each audio request is limited to 2 minutes in length." Does anyone know what "audio request" is? Does it mean that it's limited to 2 minutes when doing real-time recognition, or just that longer periods will count as more "audio requests" and result in a higher bill? Do they provide a way to send audio via WebRTC or WebSocket from a browser?