It would be nice to have some idea of the length of the instance that is up next. Some are incredibly brief (walk into the room, have a cinematic, leave) others are multi-phase battles. There have been times that I have held off doing an instance because I didn’t have much time only to go in and have it be a 60 second deal. There have been other times when I thought I’d do the instance before calling it a night and find myself at it for much longer than I’d anticipated.
Just a little disclaimer like “simple”/“complex”/“intricate” or some such would do wonders.