Since you are obviously trying to make an audio disc (a direct file copy as data would easily fit), you will not be able to burn that file unchanged. If you want to stick with an audio CD, your best option would be to download a simple freeware sound editing program, cut the file into two halves, save them separately and then burn each to a disc. Pretty much any audio editor will do, just when you cut either make sure you do cut between sentences (listen to the passage where you intend to cut) or leave yourself a few seconds of overlap so that you will be able to follow the lecture's content across the disc change.
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