Or it could even be part of the artificial memories. After all, Ash Tyler needed to be able to give a reason for surviving as a Klingon prisoner for seven months when Lorca asked him, and it had to be a reason he himself sincerely believed was true.

True, but I think giving somebody artificial memories of being raped is... pretty much the same as raping them? So now we're back to "Yup, rape happened".

So: it's entirely possible Ash in real time was "only" a prisoner for ten days or therabouts.

Unless the real Ash was a prisoner in the same place.