Glass blowing, the Basilia and Doges Palace will take all morning, plus a portion of the afternoon. If you go by boat direct from the Molino Stucky (3/4 hour), watch the glass action (say 3/4 hour), return by boat to San Marco (3/4 hour), see the Basilica (say an hour if you stroll around the Piazza) and Doges Palace (two hours), that's about five hours in total.
Omit the Correr, walk over to Accadmia (half an hour),
Lunch somewhere near the Accademia - 3/4 hour, and best to head off to the left as you cross the Accademia bridge and you'll find places, or there is a place just to the right of the bridge. Otherwise you could find several places in Campo San Stefano on the San Marco side.
Walk down to the Salute, see church, and back to Accademia. Say an hour.
Accademia Gallery, say two hours.
Then walk over (south) to the Zattere, the wide path to the left of the Accademia runs straight through to the Zattere.
Walk west (turn right when you hit the Zattere) along to Nico's gelati place, take an outside seat, have a drink and watch the action (and maybe a cruise liner departing) on the Giudecca canal..
Then take the Molino Stucky shuttle boat from the Zattere back to the hotel.
Depending on the hour, you might eat on the Zattere, where there are a few cafes. Avoid the Ae Oche pizza joint - it is a dump.
I've visited the Correr several times, and it is enormous. You would need a couple of hours to just get a taste of it, and much of what you would see is very similar to the Doges Palace but on a smaller scale, mainly to do with Venetian history. Coinage,marms, documents, many paintings.