How long does it take most babies to learn how to crawl?

I have question. My daughter Ashley is almost seven months old she's figured out how to roll over from her stomach to her back with no problem. How long do you think it will take her to crawl?

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Moms Expertise
    10/14/14
    4Katie
    She is still on track and not behind. Is she showing any interest in crawling? Getting on her hands or knees at all? scooting?
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      10/14/14
      8Theresa Gould
      They are all on their own time table. She will crawl when she's ready.
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        10/21/14
        Melissa Middleton
        Some children crawl as early as 5 months, some as late as 10 months. Although crawling is an excellent tool for coordination, your child will not falter in life because she did not crawl. Some children even skip the crawling stage as my son is now doing. He finds no interest in crawling but proceeds to try to walk instead.
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        About Teesa Martens
        Born: Beaverton, Michigan
        Current: Beaverton, Michigan
        Birth: September 28
        On Moms.com since: Aug 14, 2014
        I'm the oldest of four. I have two sisters and a brother. I married my high school sweetheart James Martens he's two years younger than me. I love to listen to music hang out with family. play with my daughter Ashley and my dog Athena was put down due to her seizures