Edit after OP's comment:
You can't see other's account data or any details which is meant for personal use due to security reasons.
You can ask your friend to follow the below steps in his/her account and then you can show how much time they are spending.
From Instagram help page:
How do I see how much time I've spent on Instagram?
You can see the average amount of time you spent on Instagram within the last 7 days. Time spent on Instagram starts when you open the app, and ends when you close it or switch to using another app on your device.
To see how much time you've spent on Instagram:
Instagram app for Android and iPhone:
- Tap your profile picture in the bottom right to go to your profile.
- Tap Menu (three horizontal line top right).
- Tap Your Activity, then tap Time. You'll see the average time you spent on Instagram in the last week.
You can set a reminder to let you know when you've spent a certain amount of time on Instagram.