Generally people say only give 5 to 10 a week. Some say 2/3 daily as they so fatty. Some people say only 2/3 every other day. And others will just give them 5 twice a week and some will give them 5 once a week.
More active hedgehogs that need the extra fat will generally be given more to try keep their weight up at a better weight so they arent underweight.
So really I think it very much depends on how active the hog is. Also a lot of people have their own opinions.