The Palazzo Ducale, is open Tues-Sun 08.15-19.15 (last admission 18.20). The audioguide (4 euros) is little bit confusing, possibly because of the part closure when I was there. The tour starts on the ground floor (not covered by the audioguide) and then the main rooms, which are covered by the audioguide, are on the first floor.
Palazzo Te is open Tues-Sun 09.00-18.00, with extended opening until 20.00 on Fridays and Saturdays until November, and on Monday afternoons from 13.00-18.00.
Teatro Bibiena is open Tues-Sun 10.00-13.00 and 15.00-18.00, closed Mon. From 15 March-15 Sept it is open all day (without the lunchtime closure) on Sat and Sun. Closed Christmas Day and New Year’s Day and for events.