Example sentences of "[prep] year [prep] a time " in BNC.

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1 He also keeps the same brigade for years at a time because staff turnover in contract catering is not as rapid as in hotels and restaurants .
2 Often they are left unused for years at a time , except , that is , for all those informal human activities , like adventure play , gypsy encampments , bonfires , dumping rubbish , and grazing goats , that are not allowed where the grass is mown and the trees are carefully planted .
3 Though a particular district might remain untouched for years at a time , there was always disease somewhere on the island .
4 Even in their heyday they had been fluid entities which could be dormant in specific areas for years at a time , but the decline at the turn of the century was much more widespread than earlier fluctuations .
5 The eggs of most species are small , and although they do not contain a large supply of nutrients they remain viable for years at a time , mainly because the tiny embryo is in a resting state .
6 In any well-run firm the agreement will not be allowed to remain under lock and key unlooked at and unconsidered for years at a time .
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