It can move the calendar date by delaying when conditional residence begins. The I-829 window is measured from that grant, not from immigrant-petition approval: ordinarily the 90 days immediately before the second anniversary of conditional residence. A visa wait before residence therefore differs from an extension of an I-829 deadline after residence has begun.
Sequence, and where it is not strictly linear
Petition, visa availability, immigrant visa or a properly available adjustment, conditional residence, then the removal of conditions. The stages are not always taken one strictly after another: where an EB-5 applicant is eligible and a visa number is available, concurrent filing of an adjustment application may be possible. Whether that applies to you turns on your presence, your status and the chart in force when you act.
Write the stages out and mark, beside each, whether reaching it is within your control. Filing was. Visa availability is not.
Whether an adjustment application is available where you are, or an immigrant visa is instead used for admission, depends on your presence, your status and the chart in force when you act. Conditional residence begins on a date set by that step, and the removal of conditions is measured from that grant rather than from the earlier petition approval. Hypothetical example: an investor whose project supplies a clinical-supplies wholesaler plans the sale of a Canadian home around an expected residence date, and then has to reverse a decision nobody was ever in a position to promise.
Keep the irreversible household steps behind the events you control, and treat a projected date as an expectation until the step producing it has actually occurred.