Two months would be good. I work full time and haven't much time to spare to meet deadlines. I'm sure there are many others who study and need time to address things outside their studies.
3 months. If I'm gonna enter (which depends on when it starts, because I'm wrestling finals right now) I'm gonna need lots of time to work on my entry, which will probably look awful in the end anyway. xD
Very often I have large gaps of regular activity on-line, as a result I often learn of contests too close to the deadline to plan anything. The longer the contest runs the better my odds of finding out about it with plenty of time to participate.
Devious Comments
I work full time and haven't much time to spare to meet deadlines.
I'm sure there are many others who study and need time to address things outside their studies.
Traditional, Literature, Digital
So yes, there will be Literature.
Here is a [link] with more info.