I can’t really say much about your specific situation: every script is different. In standard script writing formats, the page is formatted so that one page , double-spaced, should run one minute if read/performed at a “normal” pace.
But what is “normal”? So much having to do with how a reading is performed has to do with things specific to each script’s tone, or “flavor”, and the characterizations that might be involved.
And as far as timing, many times a spot’s dialogue times out shorter than 30 seconds, so that an opening or closing graphic or actor tableau can sit for a few seconds, getting all the attention.
Add in a half-second front and back for fade in and fade-out, (if you have fades) and a typical “read” for a standard commercial times out closer to 25 seconds than 30. If you have too much “stuff” to say in the :30, it probably means you need a re-write, or maybe you NEED a :60, and/or perhaps you need to do more than one spot to get all the information across. I can’t definitively state which is the case for your situation, as I don’t know nearly enough about your specifics, so I’m generalizing here.
The message of a spot is like an arrow, and every extra copy-point you want that arrow to carry blunts the point of it a little bit more. Too many unrelated copy-points, and the arrowhead becomes so blunted it just bounces off the viewer, nothing sticks. Generalizing here, but I’ve seen cases where the client wants to say too many things but only wants to pay for one spot, so they figure “cram that all into one”. That’s probably the worst of all strategies, because you’ve wasted all the production budget and ad time buy on a spot that will not perform for ANY of the copy points. It’s the difference between my wife saying: “bring home a gallon of milk on your way from work”, versus reciting a list of 25 grocery items for me to memorize… with the gallon of milk somewhere in there. Guess who’s eating dry cereal in the morning.
I’ve written broadcast radio and TV ad/PSA copy for decades. Sometimes I cram so much stuff in, I’m the only guy that can read it so it sounds right and still make the time limit. But overall, less is more when it comes to the copy. You need time for music cues, sound effects, actor characterizations, moods, to all establish. A film director gets 90 minutes to do those things. I get 24 or so seconds. That’s one of the things I like about the form; it is like working within the restrictions of Haiku poetry. The limitations actually force you to tell your story more efficiently and economically, with more creativity. This is going to be one of the themes in the next chapter of “Save This Script!” which we are working on this month.
Again, sorry to hear about your feud with the voice-over company, and I hope you figure something out that works for you.