I’ve averaged 95 3-hour shows in the past 4-5 years. No idea if that's average with all the responses thus far, but just throwing it out for consideration.
Snare batters – 2-4 times a year, depending if the coating is gone or not.
Snare Resos – Once a year, depending. (I actually broke one due to my own negligence last year. Wasn’t paying attention putting it in the snare basket and the arm broke through the bottom of the head. I always bring a spare snare, so I was covered.)
Tom Batters – Twice a year, usually because the coating is gone in the middle.
Tom Resos – Once a year.
Bass Batter – Once a year, unless I break through one. (Did that two years ago, right before lockdown. I wore through the beater patch as well…sheesh. The second time in my life I’ve done that.)
Bass Reso – Only whenever the band needs a new logo head to align with the current marketing scheme. I’ve had 3 different ones over the years, so maybe once every 18 months or so?