It's available, but I don't have enough good soldiers healthy without a few days of healing at least, but it seems like my last autosave is only a day or so before the last box ticks over. I hate that they don't seem to tell you when the meter is gonna tick up.
If it's a facility and not a blacksite(there's a difference), it's not actually all that hard in comparison. Just send in the rooks with whatever vets you have available.