I think 2 minutes is about right for all skill levels. For the geo-pros, they probably need about 30 seconds (if that), but for others, 15 seconds to think about each country and guess some if you don't know is long enough.
However! I may try a speed special, with stricter time constraints :-)
I like your reasoning, people that pride themselves on their typing speed can test themselves against the clock. Those of us that like the mental challenge not the speed-typing challenge applaud you.
This is good fun! But I did find it quite hard to distinguish the blue and the green in the answer section. Not that it made much difference. Thank you :-)
However! I may try a speed special, with stricter time constraints :-)
Guinea/-Bissau and Niger/ia are the only two that consistently get me any more.