The time shows up as a dash (-) on the Prop Hunt server. I dont think this is related to the changing of ph_waitforplayers as i have used this cmd before without this problem although i could be wrong.
It could be a visual glitch, or it could be, i fear, an infinite round. Due to this, i have set this as medium priority
It is not just me, another player has confirmed that they can see it too. Also i think its been 5 minutes by now.
EDIT: the time is definitely infinite, but only for the first round. Has the gamemode been edited by the server devs maybe? Right now, the first round only ends if all props die or all hunters die.
EDIT2: This happens everytime a map is loaded