Im right there with you on doin the whole first grow thing - so take my opinion with as much weight as yours may carry...
One thing ive tend to notice - is that every grow tends to be different in some way, some how...because it is hard to replicate exact same situations every year that you grow, so sometimes you end up with differences. In response to a question like this, If I wanted to be a smartass about your question about "whether it will be ready to harvest in 55 days" would be me answering YOUR question with another question similiar to what YOUR asking like "How long is a piece of string if I cut it tomorrow?" or "How many apples grow in a tree 15 feet tall"? There are so many variables to your question that YOU would really only be the person to know that out of the populace on these forums...trust me there are many questions i want to ask here to but I know nobody can figure it out except me because I got my very individualized plants, and only I have them, not anyone else on these forums..so its hard for them to answer i guess...
My main principle that I follow in many [not all] aspects of life is - "too little or too much of one thing is not a good thing" - My point being find a happy-medium in all that you give to the plant, including your attention...not saying you are, but the people who fuck with thier plants too much HAVE A GREATER TENDANCY to arouse complicated problems - especially with growth nutrients and such - but like I said, its ok to use them, and obviously better most times for your yield of bud - but find a happy medium...check that dirt constantly to make sure its not too wet, and not too dry...look at your leaves, stems, etc...dont kid yourself into thinking that you dont know whats going on with your plants because we are new...alls it takes is patience and understanding (of course you will have to do your research on the net like all others)
and best of all you are gaining experience..so whether or not this turns out to be a fortunate growth, nonetheless you will have gained experience and that is helpful for your next grow