I see that figure thrown out a lot and it's really messed up. You can feed a sling as much it will eat, but you don't need to feed it any more than enough to keep it plump. What that amount is will depend on what you're feeding them and what temp. There is no hard and fast rule for feeding tarantulas of any size or age other than "keep'em plump, but probably not too plump".
On average, I probably don't feed my slings more than 1.5X a week if that.
As often as it will take in, if you want it to grow fast and like to watch it eat. Every other day, if want to get into a consistent eating program with your T. Weekly, if you think your T needs a diet. Monthly, if you are too lazy and doesn't want your T to grow that fast. Yearly, if you want your T to be a supper model. Never, if you want your T dead.
I prefer not to have a feeding schedule. It makes it less stressful. I just get as many crickets as I need from the petstore whenever I run out and distribute them according to the appetites my spiders had from their last feeding.
I feed mine 2-3 times a week depending upon the spiderling and the size or type of prey items they've been given. I've been using flour moth larvae a lot lately and they're pretty small compared to the ts that are eating them, so I've been giving an extra feeding to those slings. Usually it's twice a week though.