A timed option controls duration; it does not make an overloaded or incompatible fabric mix suitable. More minutes cannot replace the correct programme and capacity.
Understanding this situation
Some items may become dry before others, especially where thickness and materials vary. Extending the whole load can therefore keep heating pieces that no longer need it while the difficult item remains problematic.
A useful next step
Use timed drying only as your model and garments allow. Check whether sorting, reducing the load or a different permitted finishing method is needed. An unexplained loss of drying performance should be assessed rather than hidden by increasingly long timed cycles.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.