Driving from Gatwick to Arundel Castle on a Wednesday morning next September (grabbing the car the day AFTER we land). Arundel has staggered openings; 10am-Gardens, 11am-Keep, noon-Castle Rooms. Fishbourne opens at 10 and last entry is 3:30. Thinking of doing it 2nd because we plan on ending up in Salisbury.
Can Arundel Castle and Fishbourne both be done the same day with time to end up in Salisbury which will be our home base for a few days? Or is there enough to see that I should count on an overnight in Arundel?