How long did it take to crawl?

How long did it take to crawl from when they starting to get themselves up from belly time.. my LO done it once and that was it.. My one is 9 months and still hasn't learned to crawl. It's breaking my heart.. I've followed a lot of videos onlines to aid her to do it. But still nothing.. she knows my fil or hubby will pick her up at the slightest whinge.. I feel as though I'm pressuring her and she dont want to be around me.. she cries when my fil leaves the room and will always look for him.. but when I'm leaving i will get the occasional cry for a wee bit and that's it.. I know she will get there.. but... I can't help it when we go to local temple that other similar age babies are crawling around and even walking and it's making me wanna hide away..