Pecans take a long time to get to the point where you can use them as hardwood flooring, but if you want to give it a try you can console yourself with the delicious nuts for a few decades before you cut it down.
There are a few types that will start to bear nuts around five years after you plant them (as a young tree, it takes much longer if they are grown from seed).
You also need to have at least two different kinds of trees in close proximately for them to cross pollinate or they won't bear good crops.
Get some good advice on how to trim and shape the tree when it is young and it will make some excellent timber one day.
By that point you might be too attached to harm it though.