It is not a combined tour. It's two different tours, one starts at 9.30 another at 3.30 pm. The guide speaks two languages so you spent double times listening, less time to explore. It got worse tho, 3 languages in 2nd tour. My ears were tired+headache after all translations, very time consuming :(
Not worth it. Guide in Montserrat was a little scattered and the Artistic Barcelona we could have done on our own. Too much bus time for us.