There lies the problem - if you can't nail it down more than that then it is an absolutely useless prediction. No different than saying you could die tomorrow or in a few decades. Bottom line is make a decision you are personally comfortable with and can manage and the rest is just noise - if you don't you just pretty much put your life on hold waiting for your confluence of events to occur to get your perfect opportunity. Reality is while some will get it that is not the reality for the majority.