每节课四十五分钟。

Měi jié kè sìshíwǔ fēnzhōng.

Every class is 45 minutes.

还有五分钟就到十二点了。

Hái yǒu wǔ fēnzhōng jiù dào shí'èr diǎn le.

There is still five minutes until 12 o'clock.

走路大概需要十分钟。

Zǒulù dàgài xūyào shí fēnzhōng.

Walking takes about ten minutes.