Our tour was supposed to last two hours.
The guide arrived 15 minutes late because of "traffic" and the tour lasted less than one hour.
Don't do this tour; it's definintely not worth your money.
Note from Viator
Thanks for your feedback. Our local supplier has informed us that tour guide was indeed a little bit late, but that a person from their office met the group at the stated time, and the total duration was not affected.