After all the rain and safety car drama of the previous couple of hours, the track dried out completely as it ticked past 1am local time on Sunday morning.
A brief third full-course yellow was then called at 3:13am but when it went green again, Estre charged after Hartley, taking a couple of seconds per lap out of the leader.
Hartley pitted a lap ahead of Estre, which turned out not to matter as they joined the same safety car train with Hartley still ahead.
#6 Porsche Penske Motorsport Porsche 963: Kevin Estre, Andre Lotterer, Laurens Vanthoor
Photo by: Alexander Trienitz
Heinemeier Hansson returned to the track only to go off again, at the Porsche Curves this time, just before Colin Braun lost a left-rear wheel from the #45 Crowdstrike by APR entry.
#155 Spirit: Race Ferrari 296 LMGT3: Johnny Laursen, Conrad Laursen, Jordan Taylor
Photo by: Alexander Trienitz
Costa stayed out as the Manthey cars pitted under the safety car to claim the lead for McLaren at the halfway point, but then dropped back to third again when he pitted a lap later.