The guarantee periods run from delivery. They stop running from the date the consumer communicates the non-conformity, and for any period the property cannot be used.
On this reading, every month of silence costs the owner protection, and a developer who waits long enough wins by default.
The period stops at the date of receipt of the defect notice. Time spent waiting for the developer is not time taken off the guarantee.
Suspension attaches to the communication, so an undated conversation on site does nothing. And it attaches to the specific non-conformity communicated, not to the property in general, which is why an item-level list protects more than a complaint about finish quality.