Deep space listening: 6000 hours of research to hear continuous gravitational waves

When searching for lost keys, there are a number of possible strategies. You might try moving from room to room, casting your eye over every flat surface, in the hope of spotting the missing keys. Of course, this assumes that they are somewhere in plain sight; if they're hidden under a newspaper or have fallen behind the sofa, you'll never spot them. So which is the best strategy?