My 13 y.o. daughter and I will be visiting for several days this Spring and want to spend time at the Air and Space and American History museums and perhaps some others. I have gone to the sites and the volume of exhibits seems overwhelming and am not sure how to organize our visit to the museums to be most efficient and get the most out of them. Is there a reference anywhere to how much time is typically spent at any given exhibit. For example, it is impossible to know if one may typically take five minutes to walk through a given exhibit or whether it will be more indepth and perhaps take one hour to view. We will of course be doing other things; but, am thinking we could allocate about five 1/2 days to the museums. Can anyone give us some suggestions as to how to enjoy the exhibits the most and see as much as possible?