I'm pretty sure your referring to your G.rosea sling that molted(am I right?), because you announced it in the Tarantula Annoucements section.
If I am right, wait about 3-5 days till you start feeding it since it's only at about an inch or so. You'll know for sure when their fangs are jet black, but that doesn't mean they will eat, it just means they are ready.
If it's a large T, like 4-5", wait around 1½-2 weeks.