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I'd guess somewhere around 20mbit.

The issue is mainly about latency, in fact. We know max latency is 3000ms. Min practical is 1500ms. Probably ideal is about 200ms. An easy way to determine this, is to go look at the seed-node list, and get an average ping of each one. The outer bound will tell you a lot about the latency relative to your location, as to the average, that will be the lower and upper bound.

Right, trying a few shows the European ones are <20ms and US <200ms. I have 20mbit, not sure I can afford to tie it all up though!

pretty much as expected, US/EU is the regions where witnesses are.

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