So if a lap is around 100 seconds, and the Porsche is 2 1/2 laps down on the second Toyota, that's a gap of about 250 seconds to make up. I reckon there are about 116 laps still to run - about 200 the race distance - so the Porsche needs to average 2.2s/lap faster over the remaining distance (very roughly). It's fluctuating a lot with traffic, but I don't think Hartley is quite managing that. And of course a caution of any kind would change things - most likely help the Toyotas, depending on the exact timing.