If an architect grants an extension for section 1, and all sections have dates for possession that are dependent upon practical completion of the earlier sections, should an architect legally grant an extension of time for each subsequent section?

This has been tested in Liberty Mercian Ltd v Dean & Dyball Construction Ltd, in which the court ruled that liquidated damages were recoverable for all weeks of culpable delay with relation to each section. Thus, this would imply that an architect should grant an extension of time for each section.