Final answer:
Different holding leg times and altitudes for each type of holding.
Step-by-step explanation:
1. Standard Holding: The holding time is generally 4 minutes. The altitude for standard holding is usually between 6000 and 14000 feet above sea level.
2. Non-Standard Holding: The holding time for non-standard holding can vary depending on the specific procedure or air traffic control instructions. The altitude for non-standard holding can also vary.
3. Holding Pattern at an Intersection: The holding time for holding pattern at an intersection is usually 1 minute. The altitude for this type of holding is generally below an assigned altitude.