Between 10 and 12 miles.
North Hills is just another name for Northridge, like West Hills is just another name for Woodlland Hills. It s about 10 miles northwest from North Hollywood depending on what part of the neighboorhood your in like Valley Village.
Ever hear of Googlemaps? It s usually faster than waiting for people on a public forum to answer this question for you, especially when they are probably going to use the same effing tool. You fail.