Something I'm happy to report on these projectors (I have the rs620, but it's the same in this regard).
At 2,096 hours, I decided to replace the bulb. Still had a great picture, but I thought perhaps I'd lost more punch than I's realized over that time. I've never waited that long to change bulbs because I've always had more degradation than this over that much time.
It turns out that the original bulb had barely dimmed, as I had hoped and expected. Yes, broadcast television looks a bit brighter, but blu ray and streaming look pretty much the same as before.
Once I get 100 hours on this bulb, I expect that difference to shrink further.
The point is, these bulbs hold up very well over time. Now, I have a brand new bulb, and another one in a box with significant life still in it as a backup.
Video: JVC RS620/X9500 projector, Stewart ST130 screen, Panasonic ub820 UHD player
Audio: Anthem AVM60 preamp, Anthem MCA525 amp, B&K Reference 125.7 amp
Subs: dual SVS PC-12 cylinders
Speakers: RBH SV-661R and SV-661CR fronts, Jamo 626k4 side/rear surrounds, DefTech DI6.5R heights