Winter in Far Hills arrives quietly and then all at once: a still gray afternoon, and by dark the lanes between the paddocks have disappeared. The Todd Group Inc. plows and salts through those nights — long private drives, turnarounds, and walks cut down to pavement before the coffee is on. Come spring the same properties want mowing, trimming, edging and cleanups, and the routes run to mowers instead of plows. Hunt country is generous with space, which means more ground to cover and more room to do it properly. There is a particular hush after a storm when the drive is open and the fields are still untouched, and that hour is most of the reason for the job.