How long shall you be in London?
ロンドンにはどれほど滞在のご予定ですか（◆willやbe going toを用いるほうがよい）
How long this will last is anybody's guess.
どれぐらい続くかだれもわからない
How lovely to see you again!
また会えてうれしいわ
How lucky [sad] is that?
なんて幸運だ［悲しい］
How many books do you read per year?
１年に何冊読む？
How many people are there in your family?
何人家族ですか
How many sugars would you have in your tea?
紅茶に砂糖は何杯［個］？
How many times in an average week do you eat breakfast?
特別なことがない週の朝食回数は？
How many votes were polled for him?
彼に何票投じられましたか
How much are eggs?
卵はいくらですか
