How long should each message in your sequence be?

Voicemails should be less than 15 seconds and emails should be less than 200 words.
It varies. If you have a lot of relevant information you have to share, your messages will be longer.
As long as they need to be to communicate your value proposition.
As long as possible. Increasing the amount of information you share increases the likelihood that a lead will engage with you.

The correct answer is:

Voicemails should be less than 15 seconds and emails should be less than 200 words.