Video Length

The Christchurch City Council has asked for a one-minute video.
This means that they want it to be one minute long! (State the obvious, why don't you?)
This means that one minute and 30 seconds is too long! And 45 seconds is too short!
I think a reasonable "tolerance" would be ten percent - this means that the video could be shorter or longer by 6 seconds.
It matters because charging for showing on TV is based on length.
It also matters because you need to DO what the client wants.

If it was impossible to do what they asked for, you would need to go back to them with a new proposal. This would involve renegotiating the brief.