Based on the authors comment that they "might call you back in an hour" suggest that keeping a connection open for that long is impractical. I don't doubt ther

Based on the authors comment that they "might call you back in an hour" suggest that keeping a connection open for that long is impractical. I don't doubt there are APIs that misuse this pattern, but in some places it is the right way to go, even though it might not be obvious to the user.