The controlling factors are petition processing time, visa availability for the family's country of chargeability, and consular scheduling. A project's construction schedule is not an immigration timeline, and conditional residence is not the end of the process.
Fix the order of events
Write two timelines and refuse to merge them. The immigration timeline runs: source-of-funds file complete, subscription and wire, petition filed, petition adjudicated, visa availability checked against the Visa Bulletin, immigrant visa interview, admission as conditional residents, two years, removal-of-conditions filing and decision. The project timeline runs: capital raised, construction or operations, spending documented, jobs counted.
Hypothetical example: a Lévis marine-services entrepreneur is told the project completes in eighteen months and plans to sell his house on that basis, only to find that his petition is still pending and the visa stage has not begun. The project date told him when jobs might be created, which matters for removal of conditions, not when his family could enter. Check current processing times on the USCIS site before each planning decision, and keep the house, the school and the job resignation tied to the immigration timeline alone.