I say anything more than an hour is too long. People waste time coming up with original drums and creating bass lines. There are millions of drum kits out there that can be easily used to make a beat. People don't care how long it took to make a song or how much work or money was spent on the creation process. A LONG process is usually the WRONG process. Beats are best when made quickly and easily, but you have to be good, like myself, to pull that off.