There are some basic rules for compiling the killer reel. Although such technologies as CD-ROM and DVD are gaining in popularity, they are not yet being used to present the content of a reel. We only do it under protest. It's your portfolio, and you wouldn't ask a photographer to print his pictures on newsprint stock. There's no consensus on the number of spots that appear on the reel, but the general agreement is that less is more.
Most people advise putting between five and ten thirty second spots on the reel.
Any 60-second spots that appear on it should count as two. I like a reel that has eight 30 second spots. Myers says there's a practical reason for limiting the number of commercials to be viewed. They're giving their producers more and more to do. Because of that and the amount of reels they're receiving, they don't have the time to look at really long reels.