When you arrive to Cochabamba's bus terminal or the airport, get a taxi to Republica St. and Vallegrande St. There is one transportation stop. One block from that, on Mayrana St, is the other one. Minibuses depart whenever they get full from 6 am to 6 pm. Buses depart every day at 6 pm. The minibus takes like 5 hours to arrive to Torotoro and the bus takes one hour more. The road is on construction, but don't worry is not dangerous at all, only be patient. If you drive a car from Cochabamba take the road to Anzaldo, and from that place is straightforward, on the road there is only one cross section, but you can see a sign which indicates the road to take.