What changes the timescale
A direct cabinet change in a prepared room is different from a full renovation with rewiring, plumbing changes, plastering and new flooring. Templated stone worktops can also create a planned gap between cabinet fitting and final surfaces.
Ask for the sequence, not only a finish date
A useful programme shows removal, preparation, first-fix work, cabinet fitting, worktops, connections and finishing. It should also say when the sink and cooking facilities are likely to be unavailable.
Allow for checks and decisions
Final measurements, appliance details and material lead times should be settled before work starts. Quick answers to genuine site questions help, but major changes during fitting may add time and cost.