This depends on how much restructuring, if any, is needed and how quickly the company can produce clear governance documentation. A straightforward case with genuine independent supervision already in place may resolve quickly; a case requiring real changes to ownership or governance terms will take considerably longer.
Do not rush past an unresolved structural question
Set a milestone for receiving and reviewing the company's ownership and governance documents before any filing or admission request proceeds. If restructuring is needed, get a realistic estimate for how long that will take from the company's side, since it may involve legal or corporate governance steps beyond the immigration case itself. Avoid setting a start date until the employment structure question is actually resolved.
There is a sequencing point that saves weeks. Request the corporate and governance documents at the same moment the offer is received, not after the professional qualification has been confirmed, because those two enquiries run in parallel and only one of them depends on another organisation's cooperation. Where restructuring is required, the limiting factor is usually a board or shareholder approval process with its own meeting calendar, so ask early when the next opportunity to approve a change falls.
A start date agreed before that date is known is a date that will probably move.