New2grammarIs the preposition for following 'wait' always obmitted omitted?
No. It's required when the person(s) or event you're waiting for is mentioned next.
We waited for our parents at school.
We will wait for you at the corner.
They waited for the concert to begin.
It's not required when the amount of time you wait is mentioned next. In this case you can say for or not say it.
The man left because he couldn't wait another hour.
The man left because he couldn't wait for another hour.
CJ