GGB Treat work authorisation as a governed dependency, never a date you can promise. The process is sequential and paced by the authorities, so what you actually control is readiness: complete documents, clean applications, files started as early as each offer allows, and parallel candidate pipelines so one stalled file does not stall a whole wave. Confirm current requirements with the relevant authority for each role and nationality, build the calendar on dependencies rather than best-case assumptions, and hold contingency in every wave. This is planning method, not immigration advice.
From The Pre-Opening Recruitment Calendar — Hiring Backwards from Opening Night — the full reading, with the method behind this answer.