A Year & A Day
Arcane magic is newly reborn but still lagging behind scientific progress, as most arcane casters are spontaneous and the world recovers from the Spellkiller Inquisition. There are still prepared casters around, but they are rare and secretive, whether in cabals or covens. The notable casters are witches, who draw their power through patrons and tribal knowledge, frequenting the outskirts and merchant roads between cities. It is these practitioners which influenced the derogatory name for arcane casters of “Frogs”.
Inside city limits, spell levels above 3 require state approval, licensing, and you can consider your free-roaming adventurer days done, because you’re a mage for the state, now. Of course, wide-use magic detection is only so precise, and if your licensing says you only have spells up to a certain level, well, who’s to say otherwise…