Far enough that the slowest document, not the construction programme, sets the date. A registrar’s transcript, a credential evaluation and a corrected employer letter each move at their own pace, and none of them accelerates because a contractor needs somebody on site by a particular week.
The slowest record sets the date
List every record the application depends on and write the realistic arrival date beside each one. The corrected offer usually waits on somebody at the employer who has other priorities. An institutional transcript waits on a registrar. An evaluation waits on the transcript arriving first, and then on the evaluating service. Once those dates exist on paper, the earliest defensible travel date becomes visible, and it is frequently later than the date already discussed by telephone. Say so plainly rather than agreeing and hoping, because an application presented before its evidence exists is not faster; it produces an adverse record that has to be explained afterwards.
Hypothetical example: an interior designer in Roxton Pond is asked to specify and detail the millwork and finishes package for a commercial fit-out in the United States, with the site handover fixed roughly five weeks away. The dependency chain runs backwards from the start date: the employer’s signed description of the professional deliverable, then the diploma and transcript, then any evaluation, then the decision on whether to present at a port of entry or wait for a petition. Assign a person to each record and a date on which the plan changes if that record has not arrived. Booked travel is not an evidence plan and should never become one.