I've now heard that construction may go on up to 2 years after I moved in, now that was difficult to grasp and hear... and very surprising to me. It was also surprising to learn was that the builder can give you a time estimate and then keep changing it...
You can ask the questions, but for the most part they can tell you whatever they want. Salespeople always tell you that the common elements will be ready "very soon after you move in", but the promise doesn't necessarily mean anything."
—First Time Condo Buyer