[quote=@Chromane]How hard is it to imbue a mortal with magic? I'm just trying to get a timescale compared to other powers and in no way plotting something...[/quote]

At a guess, it would take about as long as it would take to give that mortal physical traits equivalent to the powers you're trying to imbue. If you're trying to give a human comprehensive powers of flight, to do so by granting them large wings, a tail, and a lightened skeleton would take about as long as giving them the capacity to do it magically- Probably like ten minutes if they cooperate. However, there can aspects to magical power that it might be easy to overlook. For example, we usually don't picture a superhero with the power to fly as growing tired when they do, but a human given wings would obviously tire pretty quickly if using them to the same extent. Your magic flight man may not tire in the same way, but his abilities would still run dry after a while until they have time to recharge (or you recharge them yourself, or do it via your divine realm). Giving the ability to fly without growing tired, either magically or biologically, will take quite a bit longer. Some examples of things to consider:

-Fire mage needs to consider being protected from their own heat, the limitations of their magical or chemical fuel, and whether they can control the fire they've created.

-Necromancer needs to consider whether they can control the zombies they animate, over what distance they can do so and through how much interference, how many they can animate, how much autonomy the zombies have, and how much reconstruction they can do to a damaged body.

Why give mortals these traits magically instead of biologically, then? Having magic is harder to notice and less intrusive to grant. Humans may (or may not) be happier to accept magic than they will be to having their bodies altered. They are also more dependent on you or your realm for their power. Whether that's a good or a bad thing is open for debate.

E: Sort of what I'm thinking is that players will find the balance between biological and magical traits that produces supernatural species similar to our myths and legends. Since I keep bringing dragons up, let's take a look at them: Biologically, they're dangerous and flight-capable predators. Magically, they can also breathe fire. Whether their ability to support such a large body both on land and in the air is magical or physical is ultimately irrelevant- It only matters that they can do so, and that's pretty unusual, so it would take a bit of extra time to create that trait.

If you want to go full bio, full magic, or even full cybernetic for the powers you create, though, feel free to do so.