Longer than the sale itself suggests, because the older links in the chain are the slow ones. Registry searches, historical tax records and estate documents commonly take weeks or months, and they should be started before the funds are committed.
The oldest document sets the schedule
Recent documents are fast: the closing statement, the current year's tax filing, the bank statements. The delay sits in whatever proves the earlier ownership, and that is where to begin. Order registry copies first. If an estate is in the chain, locate the probate file. If a historical tax filing is needed and the copy is not at hand, ask what the tax authority provides and how long it takes. Running these requests in parallel with the transaction, rather than after it, usually saves a month or more. Note also that the investment threshold is subject to scheduled adjustment, so a long evidence-gathering period can cross a change in the amount required; confirm the figure applicable to the actual filing date rather than the one that applied when planning began.
Hypothetical example: A cartographic-software founder is ready to subscribe, but the sale of the founder's company will not close until the next quarter. The first review should sequence sale documents, receipt of proceeds, tax records, capital transfer, petition preparation, and the separate visa or adjustment stage. A sale agreement alone does not prove that the investor received lawful capital. Conditional residence, if later obtained, has its own two-year period, and the removal-of-conditions petition has a defined three-month filing window immediately before the relevant anniversary. Project job evidence should be preserved from the start, because the later filing tests whether capital remained at risk and jobs were created as required.