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.
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