GR10 and Playa Pucol.

On Wednesday did a fabulous GR10 session. At the top the sunset over the Calderona hills was stunning. Then I ran further and saw dusk over the med. Then the next day I did Playa Pucol from the station. Again it was 48 minutes, is it really only 8 km ? I thought I was running really fast. But that only gives me a speed I did the marathon at