It's low, like 100-200ms. I used mumble for a few years to bridge a VHF radio between an airport and a remote site via the internet. The tricky bit was getting

It's low, like 100-200ms. I used mumble for a few years to bridge a VHF radio between an airport and a remote site via the internet. The tricky bit was getting the push-to-talk on the radio to work, which required some circuitry and some source code tweaks...