Well in my case I am not limited on space so I can afford to play with stuff like that, even keeping it in the veg room when other plants go to flower. So in my case I would just see what it does out of curiosity. I wouldn't set a hard deadline, rather just observe and learn.
Really it's totally up to you when to cull a plant. Many would just toss it now because they don't have the time, energy or space to dick with it.