Estimate time from the actual missing records, who must provide them and the procedure being used. An employer’s first filing does not by itself determine how long preparation will take.
Start the documentation process earlier, not later
Identify the outstanding employer records early and assign a person to confirm each fact. Allow time to reconcile inconsistent descriptions before a planned work start. Use the actual file’s dependencies rather than an assumed timetable based on the employer’s experience.
The better sequence is to let the employer confirm three things first: what the applicant will be doing in the opening weeks, when the engagement begins, and how long it is now expected to run. Build the rest of the TN timeline around when verified records are realistically expected, not the other way around, to avoid pressure to file with documentation still incomplete. A university takes time to issue an official transcript, a regulator takes time to confirm registration in good standing, and an employer that has to rewrite a job description will not do it overnight. In the meantime, everything that does not depend on those records, including the employer's supporting letter and the structural questions, can proceed in parallel.