Time and magic

So, I brought up a question in another thread which has rattled around the back of my mind for quite some time and the reply that came back has left me more curious.

Basically – How have you found magic relates to time?

What I’m thinking of is how some things would take a lot to happen instantly but only subtle changes to happen after a certain amount of time. So have you had an experience of magic affecting the past to cause something to work in the present; do you see it as working like this; do you feel magic can flow into the past or is constraint, like ourselves, to the present and future?
I know that, in physics, time is considered a dimension like length and height so does magic work over extra dimensions?

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