We do try to work out the details on every bit of action. Note that Burt takes cover inside an oil drum as he is swallowed. So a little air is trapped with him. He mentions that he has “limited air” on the radio. Also, a person can survive at least three minute without air. From the time he is swallowed til the time he is cut out of the Graboid is 3 minutes and about 14 seconds, actual screen time, although in “movie” time it does feel longer. Finally, Burt plans for everything, and has probably done breath-holding exercises like deep sea free divers, right?
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