1. about a year (got my shotgun for christmas last year)
2 and 3 have the same answer: at least 2000 (that's just a vague estimate)
4. I've only owned one shotgun (Winchester SX2), but my family has two others (a Benelli SBE and an Ithaca Lightning).
As for the technology discussion, I've only tried a few things differently with my gun. The first of which was a fiber optic front sight that my dad brought home one day to try. I shot one round of trap with it and took it off because apparently my eyes will only focus on one orange thing at a time and they kept focusing on that damn pipe. Ever since then I've just used the single bead that came on the gun.
I've also bought a "poorman's mag tube recoil reducer" from Tom Morton and Co. that I like and have kept (although it's probably a psychological thing more than anything). My last purchase was a Briley extended Full choke tube. I bought it partially because a lot of the people on shotgunworld say how brileys pattern better than any factory tube, but mostly because it was getting to be a PITA to have to tighten my factory choke tube with a wrench halfway through a round of trap. However, it does
feel like the briley tube patterns more consistently and has less holes than the factory tube, but maybe I'm just getting better
. The only other things I plan on buying in the near future are a T&S shell catcher and possibly a
hunter's helper from Cabelas so I'll have a place to rest my gun while I'm not shooting (yeah, I know I'm a wimp ).