Allow several months. Gathering corporate records, writing the role description and preparing the petition takes weeks, and USCIS processing follows. Premium processing shortens adjudication but not preparation.
Work backwards from the subsidiary's need for a manager
Hypothetical example: the outgoing U.S. manager leaves at the end of June and the parent wants the transferee in place by July. Begin in February. The first month goes to records: share registers, both companies' financial statements, payroll charts and the signed duty descriptions. The second month goes to the petition and the employer's review of it. Filing with premium processing, where available for the category, brings a decision within the service window, but any request for evidence pauses the clock. After approval, a Canadian citizen may present the approval notice at a port of entry to be admitted in L-1 status; the family can travel with him or later. Do not sell a house or resign on the strength of a filing receipt. If the timeline is genuinely impossible, a short business visit to meet staff may be permissible, but performing the manager's job on a visitor entry is not.
Hypothetical example: an artisan ice-cream distributor wants a Canadian executive in the United States before its summer launch, but its U.S. payroll will not begin until after the launch. File only after the company can describe the real staffing and reporting structure, not an optimistic future chart. A first review should work backward from the required start date, reserving time to collect the qualifying-year employment evidence, ownership records, and final U.S. duty description. The decision is whether to delay the transfer, revise the role, or use an existing manager until the structure supports the case. Problems arise when a rushed filing gives an unsupported start date, overlooks a break in foreign employment, or assumes the seven-year L-1A maximum can be extended by changing titles.