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the same height as your counters
Far enough that it does not blind you when you are working at the sink and not so far as to cast a shadow. 12" to the center of the light is perfect.
400km
all the way....... to the bottom WRONG!! SHE ISN'T THAT FAR DOWN
I am an Elmo monster.
350miles
230 miles
No, you should keep and reuse the old sink.
standard height is 36 inches and if there is available wall space you should put it as close to the sink or shower/tub as possible.
Your question cannot be answered because you did not say what "it" is.
The pipe out of the wall usually only sticks out a couple of inches. You add what is needed to the sink drain.