How fast is the sending / receiving of messages over the Bullitt app?

It very much depends on how strong your satellite connection is, which in turn depends on whether you are in a built up area or if there are any buildings or topographical details blocking your view of the sky. Typically with a good connection it is around 30 seconds. Depending on where you are locating, we can connect to a number of geo-satellite constellations including Inmarsat, Echostar and others.