That's probably only 6 hours or so of eruption? It practically stopped after the first day.
I was watching the webcams, you could see it approaching the first road, cross it and the a single digger putting some minor blocks in, then starting to block the gap in the power plant wall.
It looked really close on the webcam, but I think that when they build the earth banks they deliberately dug ditches to redirect it away. Speedy lava though!