we have not meet for a long time.
"She was quiet" = past simple "for a long time" = prepositional phrase concerning time Past simple sentence. Does that answer it for you?
The sentence is correct if you and the article 'a': "She started her journey a long time ago."
A long, long time homey.
Example sentence - If I am careful with my books they will last a long time.
A long long time.
That area will be radioactive for a long, long time.
A sentence for dehydrated is, If you don't drink any water for a long time you get dehydrated.
Example sentence - The cabin had been left in disrepair for a very long time.
For a long time, England was known as a remote and misty region
The phrase (not sentence) 'long-standing army' is grammatically correct. It means 'an army that has been established for a long time.'
A long time
The pioneers settled a long time ago.