On 21 December, I will travel by bus from Aeropuerto Gran Canaria via Las Palmas de Gran Canaria to Agaete/Puerto de Las Nieves. I found timetables for buses on Gran Canaria and I found out I need to take line 60 from the airport to Las Palmas and then line 103 from Las Palmas to Agaete. However, I can't find anywhere how long the bus ride takes. Since I'm going to take a ferry, it is important to know the arrival time at the bus stop closest to the ferry terminal at Agaete.

Where can I find more precise timetables for buses on Gran Canaria? Google Transit doesn't know. Is there any other search engine I may use to find arrival times, or, equivalently, the duration of the bus ride?