Readmission at the Venice Accademia?

I don't know for sure but I doubt it - how could the ticket checker know the same person is using the pass again, and not passing it on/selling it to someone else?

There may be a long-term pass that allows unlimited admission (similar to one of the passes for Firenze),

If no one posts a definite answer here, you can contact the museum directly or perhaps that information is posted on the official website.

I visited the Venice Accademia last fall but did not explore the limits of the ticket. For sure, nobody was offering hand stamps when you left the building.