Final answer:
The primary time window for the administration of fibrinolytic therapy, timed from the onset of symptoms, is within 3 hours. Prompt recognition of stroke signs and seeking immediate medical attention is crucial for timely treatment.
Step-by-step explanation:
The primary time window for the administration of fibrinolytic therapy, timed from the onset of symptoms, is within 3 hours. If a thrombolytic agent is administered to a patient within this time frame following a thrombotic stroke, the patient's prognosis improves significantly. It is important to recognize the signs of a stroke and seek medical treatment promptly to ensure timely administration of fibrinolytic therapy.