Number + 小时
小时 is the standard measure word and noun for "hour" in Chinese. It is used when specifying durations of time or rates involving hours. For example, 每小时 means "per hour."
我每天至少花两个小时学中文。
wǒ měitiān zhìshǎo huā liǎng gè xiǎoshí xué zhōngwén.
I spend at least two hours every day studying Chinese.
从这里开车到机场大约需要一个小时。
cóng zhèlǐ kāichē dào jīchǎng dàyuē xūyào yí gè xiǎoshí.
It takes about one hour to drive from here to the airport.
她每小时能打三百个字。
tā měi xiǎoshí néng dǎ sānbǎi gè zì.
She can type three hundred characters per hour.