So update 1.07 dropped today for PC.

A few balance bits and bobs and bugfixes happened, but the biggest change for speedrunning is the Head Ghost trigger was changed. Now it's triggered by standing in one area for too long.

I've yet to test this, but I'm not sure if the 100% trigger chance in the hall before placing the metal talisman even still happens. If it doesn't, it'll fundamentally change the way the 100% Ghosts run is performed, possibly making times on any previous versions (and PS4, which is as of yet unpatched) obsolete or having to be relegated to a separate category.

On the bright side, it'll make hell modes a lot easier. I can't tell you how many times I've gotten screwed when she randomly shows up.

Is it ¤only¤ triggered by standing in one place too long or in addition to previous spawns?

Just tested it. There was a guaranteed spawn after the cutscene where you spawn in the room with the lighter (she was in the hallway immediately after) but she doesn't appear there any more. The run will have to be altered to account for that, and I don't think that update has reached PS4 yet.

I didn't test how long you have to wait in one spot, though. It may be possible to get her around the same time as the toilet ghost, I just need to time how long it takes to spawn her.

So I just started running 100% ghosts the last couple days and I have no idea where and when to make the floating head ghost appear. I had a 53 min run where she never appeared and I honestly have no idea on what to do.

I tried waiting for her but after 15 minutes it seemed like it was even pointless to try. Some places online say she doesnt spawn until 1 hour of in game time which I hope isnt the case T_T

She just shows up completely at random sometimes. Typically you just listen for her. I've seen her appear any time after you get the lighter but never before. Personally I don't think she should be included in the category unless everyone runs on something earlier than 1.07 because honestly you could potentially wait hours and never see her and that's not a very good way to compare times for this game. And even in 1.06- she just spawns automatically in the hall after the lighter so it's not even like it changes any strategies since you are always going to be passing that area at that time.

yeah ill do more experimenting to see if I can make her spawn 100% but its not looking good so far