The question “How long do you exercise?” refers to the duration of your exercise sessions. It is asking about the amount of time you spend exercising each time you work out or on average during your exercise routine. For example, you might answer:

• "I exercise for 30 minutes."
• "Usually about an hour."
• "Around 45 minutes each session."

This question focuses specifically on how much time you dedicate to physical activity, not the type, intensity, or frequency.