I came across the following sentence:
Tā de jiā hěn jìn, zǒu wǔ fēnzhōnɡ jiù dào le.
Her house is very close, only need to walk for five minutes to arrive.
Question: Why is there a particle 了 at the end?
First, I thought this 了 could mean completion (see Expressing completion with le in resources.allsetlearning.com ) of the action walk for five minutes and arrive. But then I also saw this sentence:
Wǒ de ɡōnɡsī hěn yuǎn, zǒulù yào yí ɡè xiǎo shí.
My company is far away, it takes me an hour to walk there.
Which is quite similar in meaning (I could understand also the action of it takes me an hour to walk there is completed), but doesn't have the particle 了.