How to see time spent on Instagram - Intagram Activity feature
You can now view time spent on Instagram and set reminders when you hit a certain time of activity on the app.
The new your activity feature on Instagram shows you the last 7 days of activity you've had on Instagram.
You can view this in your settings menu by clicking the 3 lines on the top right of Instagram on your profile page. Under the activity menu, you can set reminders and change your notification settings.