If the hiker instead traveled an average of 900 miles in just 8 days, and still increased his daily average to 16 miles, thereby reducing his remaining journey by a certain number of days. He then finds the same shortcut which saves him an additional 4 days, and the friendly traveller provides the same advice that saves him 40 days. The weather still saves him 21 days in total. In this scenario, how many days in total did he save on his journey?