Kinda funny that this would come up, as I just started putting our filament statistics into a spreadsheet about 10 days ago.
I only did 2015-2016 so far, Cameca SX-100, with EBS AR-CAMO-R (the ones with hips) rebuild filaments, UC Davis lab.
F1 - late 2014 through April 29 2015 - 775 operational hours
F2 - May 1 - May 31 - 252 hours (not sure if this was a false-out from out failing +/-15v supply or if we blew the filament. fixed the supply in November)
F3 - June 1 - June 28 - 99 hours (probably same false-out - this was also the month we had a vacuum valve go out and spent 3 weeks getting Cameca re-instated as a vendor

)
F4 - June 29 - Aug 9 - 412 hours
F5 - Aug 10 - Feb 2016 - 844 hours and still strong. (Jan 2017 update - F5's beam stability graph has become noisy so I replaced it - final hours: 1535 - here's hoping the new one lasts until 2019!)
Some of our filaments never seemed to want to saturate well - the heat was cranked up to 250 and they still looked 'ugly' as far as the gun scan image. We tried adjusting the height & etc but they wouldn't cooperate. The F4 filament was one of those. Beam was stable on the tests though so we crossed our fingers. We had one old VL-type (the one without the hips?) that ran for about 2500 hours before we took it out. [Just checked, 2425 hours total, including two weeks where it ran 539 hours non-stop. I'll have to go through the logs to find out if it was just left on by accident or if that was that one time we did over 2000 points per week on MORBs]
I'll make a better list when I get around to adding up the previous years. I have statistics going back to the 2002 installation!
We check the saturation every few days, generally run a few heat values under full saturation. Our latest filament has been one of the best behaved yet, the alignment's very nice and hasn't moved much, saturates around 220 (measured 234) and, well, we'll see how long it lasts!