we all know that light takes time to get from one place to another, especially if the destination's velocity is not relative to the source
what i want to know, is what the equation is to calculate how long it will take for light to get from one place to another, and, if possible, how i can change the value of c
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Well, c becomes slower in materials. So c0 is the speed of light in the vacuum and it is defined as c0 = 299 792 458 m/s exactly. So you can take a bath in water and you will see very slowly light waves there. But still fast, ask Tscherenkow (rip) !