Only with premium processing and a file that is already complete. Allow time to fix the client contract's control clauses and to assemble the knowledge evidence before filing; those are usually the slowest parts, not the adjudication.
The contract, not USCIS, is the long pole
An L-1B petition on Form I-129 with premium processing is adjudicated within the published premium window once accepted, and a Canadian citizen can then apply for admission at a port of entry without a consular appointment. Eight weeks is therefore possible in principle. The delay usually comes earlier.
The client contract has to be negotiated so that supervision and control sit with the affiliate, and mining clients often have standard terms drafted for contractors that say the opposite. The knowledge evidence has to be assembled from internal systems and reviewed for confidentiality. The qualifying year's payroll has to be pulled and checked for any long U.S.
trips. A request for evidence resets the clock, and the commonest requests in offsite cases concern exactly these points. Tell the client the mobilization date is contingent on approval, start the contract redraft immediately, and file only when the control question is settled on paper.
Hypothetical example: A wildfire-mapping software company needs its proprietary data-conversion specialist for a U.S. deployment scheduled after the next fire season. Work backward from the deployment date: complete the control analysis, obtain an executed client agreement, collect the qualifying-employment evidence and only then select a filing date.
The executed agreement is the record that settles supervision, while internal version records support specialized knowledge. Build contingency time for a request for evidence and for document redactions. The five-year L-1B limit, including earlier L-1 time, should be calculated before the client is promised a full assignment term.