uh... as long as you can last, or if she doesn't want anymore... there really shouldn't be any noise. Besides her zoomies if she does. Unless you're going to yell "I'M CUMMING"
Yes, as long as you can...
The noise is relatively dependent on you, usually the dog will not make a sound, unless you surprise and/ or hurt her. If the dog has you in her heart or she likes you well, she should not make too much noise, except for a possible haste or impatience from her.