Example sentences of "may [verb] for [adj] hours " in BNC.

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1 They may moan about it every Monday morning , they may agitate for shorter hours and longer holidays , but they need to work for their self-respect . ’
2 If you are having a baby for the first time : Your labour may last for 24 hours .
3 These effects may last for 3–4 hours post-operatively .
4 These continuous blasts may last for several hours , and in that time they eject large volumes of ash , which is always new magmatic material , rather than shattered bits and pieces of old rock .
5 A singing session may continue for 22 hours , incorporating many songs lasting from 8 to 20 minutes each .
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