They are very short books, and written at about a 6-8th grade reading level. As a prolific reader you could churn through them in a year or less. It's not unusual for me to read one in a single sitting, but I am a very quick reader. Regardless, I would instead recommend savoring them a bit rather than trying to read the entire series at once and making yourself crazy.

They generally don't build on each other or require that you have read the prior books, so if you put them down for a few years and come back you won't be too lost.

Ah that’s good to know. Yeah I frankly haven’t looked into them. Might have to give them a shot ;)