My mistake, Tim.
KLAS (CBS) and KVBC (NBC) are sword fighting for #1 constantly. Depending on who you talk to, KLAS or KVBC used to be the dominate and the other one is catching up.
KTNV (ABC) is the loveable third place station, but they are jumping in the ratings. I think they were up in every newscast, primarily the AM newscast (Mark Pfister is a hoot - usually...).
KVVU (FOXY) is fourth, but they are new and only have 2 newscasts. They have the longest local newscast of the four stations (in the AM). They have some good shooters too!
As for turnover, there really seems to have been a mass exodus from Vegas at all the stations. I think FOX just had 3 or 4 openings, though I don't know if they were new positions or not. NBC as McColl said has 3 openings, I think ABC has or had a couple of openings and we just hired 5 new photographers in the past month.
I think everyone just figured that while this is a great news market, it's a shabby place to live.
But anyway, prior to that, and I can't speak for the other stations, my station the average life of our photogs was 3-4 years which I think is decent for a medium market station.