Tool

Here a little list of the Utility and tool for video workflow:

You can calculate the duration of a script using this site: http://readtime.eu/

You can create a computer-generated voiceover here:
https://ttsmaker.com/

http://www.fromtexttospeech.com/

https://www.naturalreaders.com/online/

https://ttsmp3.com/

Here a resource for free image bank: https://www.pexels.com/

Youtube sound library: https://studio.youtube.com/channel/UCTp5h-NKoHy-w2wnJcmR5hA/music