I don't understand the function and meaning of the "at" in the following examples. Is the "at" necessary in these phrases? Could it be omitted?
At over 17 minutes in length, it is a tour de force that requires multiple listens to truly appreciate its majesty. (Is it possible to just say "over 17 minutes in length")
At 5 minutes in length, the complete "Murder to Excellence" is the longest track on the album. (Is it possible to just say "5 minutes in length")