How long have you studied English?
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How long have you known your best friend for?
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How long has it been since your birthday?
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How long have you been awake today?
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How long have you lived in your house?
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How long have you had your current hairstyle?
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How long have you liked your favourite TV show?
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How long have you had your current cell phone?
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How long have you been practicing something?
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How long have you been able to ride a bike?
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How long have you been alive?
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How long have you had a computer/ ipad?
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How long have you had an email address?
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How long has it been since you travelled by airplane?
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How long have you known me?
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How long have you known how to swim?
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