Guess I look at this differently. If a DX station is wasting long periods of time trying to work a QRP station then shame on them not the QRP station. All it takes is a "sorry no contact try later" and off to the hundreds and hundreds waiting so patiently. Conversely if a DX station wants to try for 8 hours to work that one QRP station then that's their choice isn't it. Not everyone can be as efficent and thoughtful as you. Especially those darn foreigners.