Wolfram|Alpha readily accepts the following input:

China boundary length

It gladly reports that the boundary length of China is 22772 miles, and a host of other information that I'll never need.

However - I'm trying to work out the boundary length of Hunan, a region of China. So I type:

Hunan boundary length

And Wolfram|Alpha reports that the standard computation time exceeded.

What I'm looking for is a simple piece of information, and if Alpha already knows the answer, it'll give it to me. Otherwise it's probably analysing Google Maps to manually work out the perimeter. So how would I go about working out the boundary length of Hunan?