It takes him less than an hour to finish reading a book.
spend和take都可以表示“花费”时间做某事
spend的主语必须是人，常用于以下结构：(1)spend time／money on sth.意思是在……上花费时间（金钱）。例如：I spend 2hours on this math problems.
(2) spend time／money (in) doing sth.花费时间（金钱）做某事。He spend less than an hours reading the whole book.
可以使用take
常见用法有以下几种：(1)it takes sb.＋时间＋to do sth.做某事花了某人多少时间。It takes him less than an hour to finish reading a book
(2)doing sth. takes sb.＋时间,做某事花了某人多少时间。
finish doing sth 完成某事
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