I was level 21 when I go there. At the time I got there, I felt like I really accomplished something. Krokotopia is still one of my favorite current worlds.
I got in at about level 16, doing all side quests. At level 22 or so I took a break to do some of Grizzleheim, Triton underwater, Sunken city, all of Wysteria, Winter bane hall, Midnight Sun Pagoda, and Mount Olympus. So I got back at around level 35. Krokopatra was sooooo easy! Being a little bit ahead is a good thing, young wizard.
lol, same thing happened to me, I did sunken city, the underwater area in triton Avenue, Mount Olympus, Grizzleheim, and Wisteria, then went back to Krock.
I would like to say that the normal level to start Krok is about 10. Doing speed lvl'ing to get to 20+ is not a good idea once you start questing. I had experienced that.
A pixel friend took my fire to all the dungeons, like Celestia and Mooshu, and I was about 25 in Firecat Alley, and it was a struggle. I ended up deleting that character.
I strongly suggest not to speed lvl, just play the game like a normal person would.
Of course you can have a max help! I'm not against that.
I was like lvl 10 when I started Krokotopia and around 20 when I finished it. I lost the main quest during The Krokosphinx. I eventually got it back though.
Level 16. I didn't do Grizzleheim and Wysteria (Im still level 24 at the moment) yet and now i'm on Marleybone. I was stuck on Wizard City since 2014 but now i'm progressing pretty quickly.
My first wizard I'm thinking I was level 15 or so. I was struggling on and off for weeks trying to get there since at the time I had no idea that side quests were a thing, and I was hung up on completing the fishing quest with only a frost lore and no luck elixir someone finally told me that I had to do something else with Ambrose and I ended up doing that and getting there with a few more wizard city quests left.
On my second (and now main) wizard, I was halfway through level 19. I took my time this round, and I did all the quests in wizard city except fishing, jewel socketing, and photomancy. It ended up taking less time overall once I knew what I was doing. In retrospect, starting off mainly soloing with a balance wizard and no secondary school was not helpful, but again, I didn't know what I was doing
For me, it was when I was 13 or 14 on my first wizard. On my storm, she was level 20, since she did a lot of the gauntlets twice to get the xp, so she flew through Krokotopia fast solo.