File well before the first commissioning window, since USCIS processing and any request for evidence take weeks. Do not plan to start work on a visitor entry while the petition is pending.
Harvest sets the deadline; the petition sets the start date
Hypothetical example: the U.S. affiliate has installations that must be running by early September and it is now late spring. The petition should be assembled immediately, because the evidence collection described above takes longer than the drafting. Premium processing, where available for the classification, gives a decision within the service's window after filing, but a request for evidence stops that clock. Once approved, the technician, as a Canadian citizen, may be admitted in L-1 status at a port of entry with the approval notice. Do not send him earlier as a visitor to 'get started'; performing the commissioning work on a visitor admission is unauthorized employment and puts the later petition at risk. If the season cannot wait, the affiliate should consider hiring locally for the first installations and reserving the specialized work for the L-1B start. A denied or delayed petition should be discussed with the customer, not hidden.
Hypothetical example: a food-safety sensor company needs its Canadian algorithm specialist for a U.S. product launch, yet the controlled manuals are being revised during the same month. Freeze the evidence version used for filing and explain any later update rather than mixing drafts. A first review should set dates for confirming the continuous foreign year, gathering relationship records, choosing individual or blanket filing where applicable, and preparing the travel plan after approval. The concrete decision is whether the launch can proceed with U.S. staff while the petition is prepared carefully. Problems follow when an employee begins performing the U.S. role while visiting, when a petition relies on documents created after the fact, or when a planned assignment ignores the category's five-year aggregate limit.