Example sentences of "it takes several " in BNC.

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1 If left for more than about 20 minutes after a run , it takes several turns of the starter before it fires .
2 It takes several months for the dust veil to spread in this way , and then perhaps a year or two for the material to fall out of the stratosphere and for normal warming of the Earth 's surface by the Sun to be restored .
3 As it takes several years for the effects of changing the number of trainees to become obvious the failure to implement Achieving a Balance is only now becoming evident .
4 And because it takes several months , and often a year or more , before a lender seeks to repossess , the 1991 repossession figures reflect the interest rates charged in 1990 .
5 Similarly , it takes several hours before ozone is formed from photochemical actions involving oxides of nitrogen and volatile organic compounds ( hydrocarbons ) .
6 Also , a Third World country which depends on an export crop for foreign exchange simply can not change crops in times of recession — it takes several years and many dollars to restructure an industry and to plant new crops .
7 Although symptoms can be controlled in most patients it takes several weeks for maximal effect and prolonged relief requires higher radiation dose regimes .
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