After there positive responds where they asked for my Skype and said that they were willing to send me a NDA, I replied with both my Skype ID and told them to send the NDA over, and this is on Sunday. So on Monday I replied if they got my replay and it's Tuesday now.
I might sound a bit dramatic but I gave them a lot of info and and they might thought why do we need this kid.
Or because they can't sign an NDA without their lawyer looking at it and their lawyer doesn't like Mondays, or because your idea sounds like an interesting one for the next strategy meeting which just got postponed until November, or it's Bob's job to deal with that stuff and Bob's on holiday, or it's Bob's job to deal with that stuff and Bob doesn't particularly care for your idea.
Or even, in an ideal world, because your idea sounds utterly amazing and they want to spend a lot of time discussing it internally but simply have other things going on right now, or want to research before calling you on Skype.
Trust me, it's often difficult enough to get a reply when the other company has a long term client relationship and is financially incentivised to reply on a particular date...
That doesn't mean they won't care to follow up with you at some point, and it doesn't mean don't chase at the end of the week if you haven't heard from them, but 36 hours is a very short time in business unless you're top of the list of priorities. And if you were their only priority then you should be more worried about where they'd get the money to support the partnership from ;-)
I might sound a bit dramatic but I gave them a lot of info and and they might thought why do we need this kid.