L-1B status is limited to five years in total, and earlier periods spent in the United States in L or H status count toward that limit. Extensions are examined against the same requirements as the original petition.
Count backwards from every previous U.S. period
Hypothetical example: the specialist spent two years in the United States on an earlier assignment before returning to Coaldale. That time is not forgotten when the five-year ceiling is calculated, so the realistic remaining period may be much shorter than the project the company has scoped. Before promising anything, collect a full history of prior U.S.
stays with admission records, and confirm which categories they were in. If the role at the affiliate grows into managing a function or a team, an L-1A analysis with its own seven-year limit may become appropriate, but that requires a properly supported petition rather than a change of job title. At each extension the corporate relationship must still exist, both entities must still be doing business, and the knowledge must still be needed.
Build the U.S. approval programme's schedule around the shorter of the project and the remaining status.