However, given the time span involved, it is possible that two collectors could be involved in a shy bladder collection (e.g., because of a shift change during the three - hour period between the first and second collection attempts). (transportation.gov)
If the average generation is seven years, then our given time span corresponds to 10,000 generations. (religion.blogs.cnn.com)
New experiences are inherently interesting, and when young, there are a lot of those in any given time span. (sbnation.com)