Final answer:
A Spontaneous Breathing Trial (SBT) typically lasts for around 30 minutes to 2 hours.
Step-by-step explanation:
A Spontaneous Breathing Trial (SBT) is a test used to assess a patient's ability to breathe on their own without the assistance of a mechanical ventilator. The duration of an SBT can vary depending on the individual patient's condition and recovery progress. Typically, an SBT lasts for around 30 minutes to 2 hours.