I've been doing some asking around and was told by agency specific instructors that the PADI Divemaster course was for 2 weeks whilst the SDI one was for 4 days. For those who've had done, seen or heard of both agencies' training, is there any difference or was the PADI one dragging it over a longer period to make it more relaxed in which case I wouldn't mind doing the PADI one then. Can't do any harm to get more dives under my belt and maybe even the chance to assist instructors or be a backup on guided leisure dives.