Its confusing. Now if I remember an earlier post correctly, because the ACO don't seem to have half of this as provisional yet
Wednesday starts at 4pm and has a 4 hour test session, a 2 hour break and 2 hours of qualifying.
Thursday starts at about 4pm with two 1 hour sessions for the support races, then 2 2 hour qualifying sessions at 7 and 10pm.
So the ACO will close the track about Noon, to bolt all the barriers together.
As for Friday, it depends on how much arsing around there is before the Gendarmerie close Mulsanne to Arnage, but my guess is about the same time