My first reaction is to say stay in Mistress/slave mode for the entire time but the longest session I’ve ever had was 4 hours so I have no experience with anything close to 24 hours or more. I’d love to do it but I highly highly doubt I ever will for both economical and logistical reasons.

Having said that the type of play you describe with breaks in between play sounds like a blast. I think for me it would depend on the Mistress, her preference and our relationship prior to the session. I would love a super intense experience of an extended session but I also like to have fun so I’d like to try both ways.
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And still trying to figure it all out.................. buffalo