I've been planting avocado seeds in the house because i've read that it soundn't be in direct sunlight till it has grown a stem but i have also read that the seed should always have direct sunlight. which one is true.
Yes keep in the sunlight. In about 3-4 weeks you'll see it split, then a sprout will start growing out of the top, as roots form in the bottom. Are you growing it in a glass with two toothpicks? I used to love doing that. Make sure when you get about 4 leaves, you pinch it back to make it spread out, otherwise it'll just grow straight up and lanky.
After I posted this, I checked at a reputable site. It says it will take 3 to 6 weeks to sprout... and don't pinch it back till the plant is about 5 or 6 inches high. Then put in soil after new leaves sprout from the place you cut back. Here's the link: . http://funadvice.com/r/15hnro18e8b