cmd/install: fix install warning timeout.

Library/Homebrew/cmd/install.rb

@@ -95,7 +95,7 @@ module Homebrew
         # If they haven't updated in 48 hours (172800 seconds), that
         # might explain the error
         master = HOMEBREW_REPOSITORY/".git/refs/heads/master"
-        if master.exist? && (Time.now.to_i - File.mtime(master).to_i) > 1#72800
+        if master.exist? && (Time.now.to_i - File.mtime(master).to_i) > 172800
           ohai "You haven't updated Homebrew in a while."
           puts <<-EOS.undent
             A formula for #{e.name} might have been added recently.