That is a real budget question and deserves a direct answer rather than an assumption. The preparation work is largely the same regardless of assignment length, while relocation, housing, and family costs scale with it. Compare the total against what the assignment is expected to deliver.
Price the alternatives honestly
Ask what the same objective would cost handled through short visits, remote work, or a different team member, so the comparison is on the table before commitments are made. If the assignment proceeds, ask whether the scope includes an extension review later or is quoted as a single engagement. Housing choices, particularly taking a term for the stated duration or with flexibility, often move the total more than the case work does.
Add the cost of the assessment that comes before all of this. Where prior U.S. time or an unusual employment history means the qualifying period is genuinely uncertain, that question should be answered as its own engagement, priced separately, before a document programme is commissioned.
The alternative — assembling evidence and then discovering the arithmetic does not work — is the most expensive order in which to do the same tasks. Ask what the assessment covers and what happens if the answer is unfavourable. Hypothetical example: a printing colour-management specialist's employer treats the history check as a formality bundled into the main quote, and only after four weeks of evidence gathering does anyone total up the previous deployments and find the position needs a different plan.