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The only one I've ever been offered that long is a survey of your radio listening for a week. If you dont listen much it wont take 4 hours ;)
Ps: there is a similar survey being offered by phone operators which offers more $
Good memories of travelling by coach/bus from San Diego to Mexico City then Oaxaca, Sumidero Canyon and Pelanque when a student. Will be interesting to see how much they've changed in the past quarter of a century .