Especially things like breathing, weighting, equipment configurations or simple things like shooting a dsmb are often not practised enough and we try to change that.
Equipment configurations – that include the mounting of instruments, correct distribution of weights, finding the correct sized tank etc. are many times not tailored to customers, but standardised configurations that can of course be personalised a lot.
Another example of things that are often improvable are weights in gerneral: a lot of divers are massively overweighted. Whilst it might be normal to them, it would be far safer if divers were correctly weighted, as buoyancy control would be easier and it would be less of a pain to deal with outside of the water.
The Big 4 influence each other, which is why the training dosen´t have a fixed course of action, as its tailored to an individual improvement.
The training can be done once or as a multiple day training if you want. Thats up to you and how comfortable you feel in the water.