It depends of course...one and a half to two hours. The intermission can vary depending on demand at the bar.
Not sure there's such a thing as an average play length -- typically plays are like movies in length and usually include an intermission.
Why should the length of the the play matter? Should it be based on the theme, story? Review the play and of it is something you are interested in; then go and watch it, the length should not matter.
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