Very cool resource. I don't think learning 15,226 words in 5.5 months, even for passive vocabulary, is remotely possible though. People spend years getting that kind of vocabulary. I personally see this more as productive entertainment you can do throughout the day when you can only spare 5 mins or so. Also like you said, the alphabetical order could be a problem for a lot of people. But ordering them by usage straight from a dictionary would be a nightmare. They do make frequency dictionaries that already have the words ordered by most to least commonly used if you really want to please those people. Regardless, taking the time to make this and sharing it deserves credit.