optimistic time वाक्य

In the optimistic time of the Crystal Palace, when progress was an article of national faith, it was easy to see the present as ascending toward an even better future; by the 1870s, it seemed to many to be more like exile from a better past.
From memory, I think the most optimistic time estimate was on the order of 4-6 weeks to make enough plutonium for another bomb after that . ( U-235, for the Little Boy design, took longer to make . )-- Anonymous, edited 08 : 49 UTC, February 17, 2008.