Videos longer than 1 minute are only available on Paid Subscription Plans. Each new video costs 20 credits to generate. On paid plans, the first 3000 characters (roughly 3 minutes) of the video will be automatically generated in the first 20-credit generation. Each additional minute costs between 10-60 credits, depending on which settings you use. So that means if you're making a 10 minute video and using only the lowest-cost settings (still images only, basic image generation quality, basic voices), it would cost about:

With animation and high quality voices, the same 10 minute video video would cost about:

You can control the settings for each scene of video generation.