Challenges for more than 100 days
The app cannot handle & show your challenge period if it is >100 days. Basically nothing above 3 digit numbers.
After 99 days it reverts to 90 days.
It should either start again from 0 (restart) & notify you that you have reached 100 days (maybe offer a badge or something to commemorate the event) or just keep counting.
But never ever revert from 99 to 90!