May I ask how long you needed? Where did you start and how do you proceed with the access hatch? With a vapor barrier below?
Of course you may ask. We started at the eaves because we have a very flat shed roof. The roof was done parallel to that and the insulation was laid when only the rafters were in place. There were three of us (one cuts, one lays, and one cleans up) and it took 12 hours. Below is a vapor barrier with sd=100 but only to protect the insulation from residual moisture. Generally, as far as I know, no vapor retarder/barrier is needed with concrete ceilings. We first cut the foil around the hatch area with sufficient overlap.