How long does amazon take to ship ?

I ordered a iphone case, that was from honkong. Well it said it would take 15 days or something? But I read the comments on the phone case, and they're we're saying it comes a lot sooner than it said. So how Long do u think it will take? Sorry I'm just really happy because its so cute and I don't have a case on my phone right now Nd I kind need one fast!