Don't you hate it when you have something really cool but you know it isn't long enough?

At the moment I have a submission that is around just over a minute and I'm really struggling to find inspiration. Originally I had a plan that would catapault this thing to around 3 mins but now it just doesnt feel right. So my dilema is, which I think alot of people face is; should I submit now when i know its really cool or should i try and stretch it out and risk losing the something special that I had?