<p>According to <a rel="nofollow" href="https://www.tibiawiki.com.br/wiki/Roshamuul_Quest">Roshamuul Quest</a> (Wiki Br) and <a rel="nofollow" href="https://tibialatina.fandom.com/wiki/Roshamuul_Quest#A_Retched_Begining">Roshamuul Quest</a> (Wiki Sp) five (5) hours.</p>According with a talk with high level friend who only level up on Roshamuul the time is 3 hours between each task.
Also you confirm the same time.