Which bike and how many times, would be a better question.
I have 5 seats for 06 and newer Dynas, 4 for first gen FXD, 4 for my old 67 (including 1 hand stitched by Mr. Corbin before Corbin was a company) and 9 custom pads for different race bikes I've had over the years.
That's just one of the Cool things about Harley Davidson's, There is or can be made a seat for any use. And no one seat is best for all riding styles, people or distances.
On the new FXDIs I like a Badlander for Hot Rodding, Riding the Mountains or Waterhole cruzeing (i.e. picking up chicks for a ride around the block on my "trick Pony"), a 1 up Danny Gray on the BBB for Racing or Showing off, a 2 up Sundowner for Traveling, 2 stock 1 ups that came on the bikes and a Mike Wilson Stingray for show.
More or less the same with the other bikes, a seat for every ride and a ride for every seat.