Example sentences of "30 seconds ' [noun sg] " in BNC.

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1 The first and most obvious change is to increase the duration of each exercise , but keeping the rest periods constant , that is 30 seconds ' exercise followed by 1 5 seconds ' rest .
2 The first bell you hear is the 30 seconds ' warning .
3 Moving heavy deliveries up six flights of stairs , running through the streets with cartons of clothes at 30 seconds ' notice , for maybe ten francs ( £1 ) a time .
4 It therefore follows that even if you are two points ahead at the 30 seconds ' bell , the opponent can still pull these back and take the final point to win .
5 Similarly , if you are lagging behind at the 30 seconds ' bell , it is not too late for you to win the bout .
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