Tics are repetitive, anywhere from several a minute to only a few times a day.
Their number and severity changes over time, and can range from being so mild they're hardly apparent to being so prevalent they disrupt life to the point where it's difficult to function. This is a fairly comprehensive List of Tics taken from a variety of sources. Onset of the tics is generally before the age of twenty one, more often around six or seven years of age. In some cases tics have waned after adolescence, but in most cases they're with you for the rest of your life. You'll see it refered to that way a lot on her site, as well as this and other sites.