Due to copyright restriction, downloaded chapters stay on your device for 30 days before they expire and get removed.
You can read downloaded chapters as many times as you’d like before they expire. To check the amount of time you have left, go to the Downloaded list in the Library tab. A timer is shown next to every downloaded chapter.
For chapters unlocked with INKR Extra, you can re-download them as long as your subscription is active.
For chapters unlocked with Coins, you can always re-download them.