One thing you have to have when you are roleplaying is patience otherwise you'll set yourself up for some disappointment. I can't tell you how long it takes for interest to found in a request thread because I don't know. Everyone is different. You might get interest now, later, or a couple of days from now it's just the matter of being patient. You can also bump your thread to make it noticeable or maybe someone else has an interest check with ideas similar to yours you can collaborate together or tell them about your idea. You just have to be patient and while you wait answer some of the requests already up.
@ParzivalOftheOASIS I've moved your Star Wars RP into Fandom. However, you've set it up as an RP, not as an interest check (meaning it's in the Roleplay sections, not in Looking for Group/Fandom) so it may still get overlooked. I suggest getting a post up in here until your RP has enough people to properly start.