The London GLobe listed its 2006 performance of Titus as running 3 hours with an interval. Movie versions range from 90 minutes to approximately 162 minutes. There is even a Japanese version that was performed at the Royal Shakespeare Theater in Stratford-on-Avon that ran 3 hours 20 minutes with an interval. A rather long, bloody and violent Shakespearean play.
I've only seen it once, and it ran about 2 and 1/2 hours then. That's stage time, so add intermission and call it 3 hours. The two film versions I'me familiar with both take about the same time.
if you look on the imdb there's a movie called Titus it shows the play at its full running time, so if you look on the page www.imdb.com you can find out. I think its something like 3 hrs and 20 min.