Student or Learner
1)It is a long journey.
The journey is long.
2) It is only ten minutes walk.
The distance is only ten minutes through walk.
Do both the sentences convey the same meaning.
I would say 'both of the above sentences', but I am not a teacher.
It is completely natural and extremely common to respond to distance questions with time.
In fact, I typically do answer distance with time, unless somebody has specifically asked me how many miles.
I could tell you that of the two nearest major cities from me, one's just under a 3 hour drive and the other's a good 4 hours, but I honestly couldn't tell you how many actual miles either one is. If I were to ask my friends, they'd answer similarly, in hours.
Mileage doesn't vary, but the time does depending on variables such as traffic, weather, who's driving, etc. So, people are more interested in the time than the actual number of miles. You can still give a sense of the linear distance though by specifying if it's a 5 minute walk, a 10 minute ride, a 2 hour flight, and so on.