Timing depends on a documented qualifying period abroad, a prepared petition, and authorization for the actual assignment; it cannot be set solely by a project launch.
Protect the evidence sequence
Create a timeline beginning with the foreign employment start date and include any breaks, promotions, travel, and entity changes. Hypothetical example: A product rollout is scheduled before the worker reaches the required overseas service period. Moving the launch date may be more realistic than treating a few weeks as immaterial.
Allow time to obtain confidential technical descriptions in a reviewable format and to resolve inconsistent job titles. Track prior time in L classification because L-1B has a five-year ceiling. If the US task changes from specialized implementation to general operations, reassess the classification rather than assuming the original approval covers every function.
After arrival, retain project and employment records that support the continuing role. A calendar should show legal deadlines, business milestones, and family travel separately so one does not obscure another. Place factual deadlines, government process dates, and commercial milestones on separate lines.
Recheck the plan whenever the employer, enterprise, family composition, or proposed activity changes. A request can require more evidence than expected, so leave time to respond without misrepresenting the present facts. Permission must be established before the relevant activity begins; optimism about a future result is not permission.
For this l1b review, keep that conclusion tied to the documents actually available. Confirm the current procedure before relying on an earlier file or informal description.