How long / How high

[Lion]

When I should use How long or How high
With examples please
Thanks in advance

[Rusty]

When I should use How long or How high
With examples please
Thanks in advance
If it is horizonal, use how long. If it is vertical, use how high.
How high is the mountain? How long is the road?
How high is the ceiling? How long is the hallway?
Long can refer to time.
How long will we have to wait?
High can refer to sound.
How high a note can she sing?
Check a dictionary for other areas where high and long are used.