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The Tekiah of Tashrat is to be at least 18 Terumatin long. The Tekiah of Tashat and Tarat is to be at least nine Terumatin long. Each Shever is to be exactly three Terumatin long. One is to blow at least nine Terumatin in the Teruah. One may lengthen the Tekiah as much as he desires. One may blow as many Terumatin as he desires within the Teruah blow. One is not to blow more than three Shevarim although some are accustomed to adding a small sound after the three Shevarim and so is the Chabad custom. See Chapter 11 Halacha 7 for the full details of this subject!
 The length of the blows is measured by the amount of Terumatin [טרומטין] worth they contain. טרומטין refers to a short blow similar to that contained in the Teruah. [i.e. Tu, Tu, Tu = three טרומטין]. Thus if one were to say that a Tekiah must contain 10 Terumatin this would mean that the length of the Tekiah must be long enough for one to blow 10 Terumatin within that amount of time. So if it takes five seconds to blow 10 Terumatin the Tekiah would have to be five seconds long.