A program to be written for copying and pasting the given url

Will give the URLs in EXCEL as input and and output should be document that is screen shot of the URL should be given in the output , the input URL will be from 50 to 300. I need a exe program so that it should automatically give the output document, the program should not run in the foreground and I just need the output document alone. What will the approximate time that the program will run for 250 URL