In addition to the original 17 or so days of them being in stasis while The Doctor was working on a treatment. 6 weeks after leaving that world, 6 going back, plus about 3 weeks in orbit? They really lost almost 4 months.
Which brings me to one thing that always bugged me about this episode, as well as "CODA"...
The captain AND the XO on a mission away from the ship??? If this were TOS, TNG, or DS9, if something happened to them both, they could get replacement command officers because Starfleet was nearby. Not an ideal situation, but at least it is a problem that can be solved. But alone in an unknown quadrant? This was a bad decision, in every respect.
Which brings me to one thing that always bugged me about this episode, as well as "CODA"...
The captain AND the XO on a mission away from the ship??? If this were TOS, TNG, or DS9, if something happened to them both, they could get replacement command officers because Starfleet was nearby. Not an ideal situation, but at least it is a problem that can be solved. But alone in an unknown quadrant? This was a bad decision, in every respect.