It depends on some variables that are not provided.
What juice are you using? What yeast and fermentation temperature?
Are you adding sugar?
It also depends on what your tastes are and what you like/don't like.
I've used juice from the store and WL cider yeast and made decent cider in 2 months.
I've added sugar and used wine & champagne yeast in the past and it takes a long time for the flavors to mellow out.
Right now I've got batches with dry ale yeast and WL002, but its too early to tell.
You can back sweeten and add frozen concentrate at the end if you like that style.
InBev, Miller-Coors and other big brewers do short turn around ciders that sell like crazy, so it can definitely be done.