At least it hasn't been a complete waste of time.
And if he had, it would have been a complete waste of time.
Trying to work at home is a complete waste of time.
I found him to be a complete waste of Money.
School is a complete waste of time for anyone who does not want to be there.
I think that it is a complete waste of time and money.
Not as a friend, maybe, but he didn't think Richard was a complete waste of time.
That turned out to be a complete waste of time.
This job was clearly going to be a complete waste of her time.
It wasn't going to be a complete waste of time.