He knew. Shortly after arriving in Luceti, I made a post on the network asking about how people were handling being dead in their world and alive here. Marco and I talked though we didn't realize it until later.

[Seven months and two days. Ginia's accurately aware of how much time has passed since her death, of how quickly the hourglass could run out. Seven months and two days and if she leaves, it won't have mattered except to the people who knew her.]

Levi and Erwin knew too.