It really really really depends on you as an individual and what you are quilting on the piece to how long it will take you, it is definitely cheaper than sending it out for the same job, some will take longer than others to do the same work, depends on how comfy you are with the machine and loading and all the technical things, you will get the satisfaction of doing the whole quilt and it is a lot easier that trying to put it through your machine at home,
Make sure that you take notes, I would try and watch a video on it first so that you go in knowing some and can focus on what you need to learn rather than spending the whole training time on simple basics.
A simple single with an all over design I can do in about 2 hours, that is loading and everything, as long as you do your planning before hand and not mess around with a lot of decisions you can do simple pantographs in around the same time or a bit longer, to start with it will probably take you longer,