((HUGS)). I'm so sorry. I don't know how long it takes for them to realize, or what to look for. When one of my pair of bonded sows passed, she was in the pigloo with the other pig. I was checking once an hour or so (couldn't sleep) and when I went down, the living pig had moved the pigloo to the other side and left her sister's body behind. They were snuggled up the last time I checked when both were living, so I presume she moved away because she realized that she had passed now. It hadn't been more than an hour since she died, and I took her out at that point. Our other pig did seem to realize that she was not coming back, since she didn't look for her at all, and when we had the sick one at the vet repeatedly, she was always frantically looking for her to come back whenever anyone walked past. It seemed like she knew not to expect her back. I'm not sure how long to leave them- your other pig may be keeping her distance because she realizes he is gone. ((HUGS)) again, and wish I could help more.