[Answer] According to NASA, approximately how many hours is the re-entry descent of a space shuttle after Mission Control gives the \u201cgo\u201d for deorbit burn?

Step 1 : Introduction to the question "According to NASA, approximately how many hours is the re-entry descent of a space shuttle after Mission Control gives the \u201cgo\u201d for deorbit burn?"

...Hint :1/24/2012