Board Thread:Plants vs. Zombies Wiki discussions/@comment-35198094-20180404080611/@comment-25877436-20180417191951

AnonymousPvZFan23 wrote: I already beat all the normal levels, I’m just seeing how long it will take to max my plant levels without paying actual money "how long" let me tell you this

I got PvZ2 two years ago, and to this day I haven't spent a penny on the game and my Bonk Choy and Repeater are level EIGHT

And THAT was because when I was completing the worlds I always did Ancient Egypt pinatas because they were easy to do

So to answer your question, it takes FOREVER