Time limit help file added.

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+<p align="center"><strong>Time limit</strong></p>
+
+<p>With time limit you can control how much time student can have
+on one quiz attempt. If time limit is exeeded, the quiz will be sent
+automatically, with current answers. If student backs down and returns
+to quiz attempt when time limit has expired, zero grade will be marked.</p>
+
+<p>Zero value means, no time limit.</p>
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