Your traffic penalty amount will be double if you are not paying on time.
Here you can check what is the deadline for your traffic penalty payment.
By this method, you can check only thro mobile apps (not on browser / or computer)
Download Absher mobile app from play store in Android or app store in IOS
Log in with your username and password
Goto Dashboard and check with Traffic Violations section
Here you can see the next due date, by pressing the date, you will get to know how many days are remaining.