Buy covfefe
https://www.goodstuffcoffee.com/8kuncoffee/
Wait, it's DHL Parcel Intl Direct.
>Voices speeded up a little in order to fit the vid into 15mgs.
You can lower the bit rate accordingly without speeding up.
This here allows setting a target file size and it will do everything else automatically.
https://video.online-convert.com/convert-to-mp4
>Have limited skills
Use
https://video.online-convert.com/convert-to-mp4
No skills required.
Simply enter 15 in the file size field.