<p>I don't know what are the factors, but I can guarantee that the durations varies a lot and is not fixed, as tibiawiki claims to be.</p><p>First I tested it by throwing 8 magic walls / Wild Growths in a row, 2 seconds between each rune.</p><ul><li><u><strong>Expectation:</strong></u> They would disappear in same order as I threw them, and with 2 seconds delay.</li><li><u><strong>Reality:</strong></u> They started disappearing in a random way with random delays, not necessarily in same order as I casted.</li></ul><div></div><div>So, casted.</li></ul><p>So, after that I decided to TIME 10 runes, here are my results:</div><div></div><div><img results:</p><p><img alt="" src="https://vignette.wikia.nocookie.net/tibia/images/7/77/Magic_Wall_%28Object%29.gif/revision/latest?cb=20140918101624&path-prefix=en" style="height:64px; width:64px"> <u><strong>MAGIC WALL:</strong></u></div><ol><li>20 WALL:</strong></u></p><ol><li>20 Seconds</li><li>18 Seconds</li><li>24 Seconds</li><li>15 Seconds</li><li>22 Seconds</li><li>26 Seconds</li><li>23 Seconds</li><li>20 Seconds</li><li>25 Seconds</li><li>22 Seconds</li></ol><div><u><strong>MIN:</strong></u> Seconds</li></ol><p><u><strong>MIN:</strong></u> 15 sec</div><div><u><strong>MAX:</strong></u> sec</p><p><u><strong>MAX:</strong></u> 26 sec</div><div><u><strong>AVERAGE:</strong></u> sec</p><p><u><strong>AVERAGE:</strong></u> 21,5 Sec</div><div></div><div></div><div><img Sec</p><p></p><p><img alt="" src="https://vignette.wikia.nocookie.net/tibia/images/9/9e/Wild_Growth_%28Object%29.gif/revision/latest?cb=20130406195515&path-prefix=en" style="height:64px; width:64px"> <u><strong>WILD GROWTH:</strong></u></div><ol><li> Seconds</li><li> Seconds</li><li> Seconds</li><li> Seconds</li><li> Seconds</li><li> Seconds</li><li> Seconds</li><li> Seconds</li><li> Seconds</li><li> Seconds</li></ol><div><u><strong>MIN:</strong></u> sec</div><div><u><strong>MAX:</strong></u> sec</div><div><u><strong>AVERAGE:</strong></u> Sec</div>GROWTH:</strong></u></p><ol><li> 47 Seconds</li><li> 50 Seconds</li><li> 37 Seconds</li><li> 34 Seconds</li><li> 52 Seconds</li><li> 35 Seconds</li><li> 36 Seconds</li><li> 50 Seconds</li><li> 37 Seconds</li><li> 44 Seconds</li></ol><p><u><strong>MIN:</strong></u> 34 sec</p><p><u><strong>MAX:</strong></u> 52 sec</p><p><u><strong>AVERAGE:</strong></u> 42,2 Sec</p>