Example sentences of "have [to-vb] at least [num] [noun] " in BNC.

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1 But remember you have to wait at least 12 weeks after the possible infection for the test result to be accurate .
2 Those with no record of social security contributions , in other words new entrants to the labour market , have to work at least 26 weeks if they are to be eligible for Unemployment Benefit when they lose their jobs .
3 If your life is so rushed that you only have five to ten minutes for lunch , and your body knows that you have to consume at least 300–400 calories in order to make it through until the evening , it is going to look for a very convenient solution , and that means , high calorie , low volume food that is readily available , such as a chunky cheese sandwich , or worse still , a chocolate bar .
4 The radial Spanish trunk network had to contend with one of the most difficult geographies in Europe , which means that most routes from Madrid to the coast have to cross at least one mountain range , while in Britain the major centres are connected across relatively easy terrain .
5 You have to fly at least 12 hours before your initial flight test and on average people fly around 20 hours before getting their licence .
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