Functionality to have a time tracker, for how many minutes you spend reading, and when finishing a session, add the page number/percentage of where you stopped, to track pages read per hour.

• Start, pause, stop session.
• Ability to add manual reading session

Book reading tracking details:

• Track how many reading sessions done for a book.
• Total read time (hh:mm:ss)
• Average stats (average pages read, average read time, average minute per page, average pages per hour)

Track per session:

• date (and time?) of a reading session
• Pages read (in that session)
• Read time (hh:mm:ss)
• Calculate average minutes per page
• Calculate average pages per hour

Additional stats one could add:

• Graph of how many pages read per day in a given period (e.g. 7 days, 30 days)
• Graph of how many minutes read per day in a given period

Why?

I personally like seeing how fast I read, and how long it takes me to read a book. It also helps if you want to have a goal of e.g. read 30 minutes a day, you can set a reading goal, and use this tracker functionality to make sure you reached 30 minutes reading)

(yes, this is inspired, by another book tracker app...)