system
Given the following post, respond as if you're commenting on Reddit:
human
[gen fantasy] Is magic constrained by the speed of light?

If a magic user casts a spell on a distant object, is the effect instantaneous or is there travel time to the affected object?

For example, some wizard on Earth casts a spell on Neptune. Does it take a few hours to get to Neptune, or does it get there instantly?

I'm not talking about the results of that spell, just the speed of magic itself.
gpt
Depends on the world, but generally magic seems to circumvent the laws of physics (or perhaps uses undiscovered laws).

Teleportation, for example, has no perceivable speed.  A wizard should be able to send a radio signal from Earth to Neptune, teleport to Neptune, and wait a few hours to receive the message he sent.