A big part of the long lags has to do with the basic DNA of Scientology. And that is the concept; you are totally responsible for your own condition and the concept that the tech is correct. ( KSW #1) The org is responsible to recruit and send a staff member to a higher org for training. The org is expected to pay for the training and the room and board. Further, the org is also expected to give a large chunk of their income to flag, and the org has to compete with the IAS for the public's $.
So, the failure of having the correct tech, "the only reason you get upbraided is from lack of results" has resulted in attacks which has necessitated a corporate restructuring and fragmentation of the organization. Rather than fix the tech, this was done so the org could survive any legal attack. Had they had simply fixed the tech, and curtailed offering the resultless parts, the attacks would have ceased. But Hubbard's ego prevented that approach.
If you couple this fragmentation with the concept of individual responsibility it all becomes clear.
In a sane organization with a good workable product, the organization would not be fragmented. So the staff would be trained at the organizations expense or recruited from colleges and universities the provide the training.
But in a fragmented organization - there is no pooling of resources. So we have these individual organizations are now being treated like the public. Each is responsible for paying it's own way. Hence Flag charges outer orgs to train their staff, and if the orgs can't pay to maintain a staff member there, the staff on training works for Flag to pay for their food and berthing etc. resulting in extended time. And that my friend, is why training takes so long.
it's in the DNA of the organization.
Mimsey