In 2007, I installed 13 windows in an older home. The heating costs dropped 30% for the same months over the following winter. Based on those savings, the windows will pay for themselves in less than 10 years. I expect them to last at least 50 years.

The average replacement window requires about 2 hours to install. Wrapping the outside with aluminum and replacing the interior stops adds additional time. Without looking at your particular project, I cannot give an exact price. Based on averages from 2007 thru 2010,  $95 per window covered the labor for installing pocket replacement windows in several homes. The average cost per window was around $300.00.