Timed Autosave + Kill update message for a shared workbook?

[solo9999]

Hi folks,

I have a shared workbook that I would like to use a a whiteboard, with several individuals working on it at the same time.
The problem currently is that is auto saves every 5 minutes. We can of course keep pressing save all the time to have the updates.
However, I was looking for an alternative way where the workbook is automatically saved every minute, and the update message is not shown.
Is that even possible?

Thanks