@Mogima It depends, If for example you do some foreplay and search for sensitive spots, You can make them far more sensible and after that it's just a matter of how much you do it. Some can do it multiple times with just a few minutes of rest between each session, But as long as you do it right, giving the proper stimuli you can do it even before going inside.
Learn how to do some foreplay, your hands can make everything much better for her if you do some before fully going inside