The majority of the List-servers are connected to the Internet 24 hours, because they are part of the services offered by some Internet Providers.

I was lucky enough to find an internet provider willing to host our mailing list as part of the hosting service for the Hepatitis A-Z web-site. Therefore subscribers no longer have to refrain from sending too many posts.
Just send as many posts as you wish. 

However, keep in mind that there is a huge difference between the volume taken by a post sent in Plain Text compared to a post written in HTML.

30 pages of Plain Text have the same volume as only 2 or 3 pages for posts that are HTML coded.

This is why we recommend that you change your settings to send Plain Text posts to HEPC-List.