(a) It takes 20 minutes to cook rice
(b) It took Al two hours to drive to work.
It + take is often used with time words and infinitive to express length of time, as in (a) and (b). an infinitive = to + the simple form of a verb. In (a): to cook is an infinitive
(c) How long does it take to cook rice? 20 minutes
(d) How long did it take al to drive to work today? Two hours
(e) How long did you study last night? Four hours
(f) How long will you be in Hong Kong? Ten days
How long asks about length of time.
(g) How many days will you be in Hong Kong?
Other ways of asking how long:
How many + (minutes, hours, days, weeks, months, years.)
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