saddle fit... definitely an art, not a science.
ive had some that felt great on the first ride. some that took a while to get used to. some that looked cushy that were rough. some that looked bare that were comfortable. ive had different "favorite" saddles over time.
its hard to nail it down because so many other thing affect comfort - minute changes in angle, length...what bibs you wear. if your ride is flat or climbs which demands (unconscious) shift in body positioning relative to saddle, etc.
strangest of all, ive had saddles that were deemed comfortable for many many rides, and then suddenly for 1 or 2 rides, with no changes in positioning, suddenly give sensation of numbness or tingling.
all that said, from my own experience, i wouldnt put up with anything that fails to feel comfortable within the first 3 or 4 rides. if it doesnt work by then, its not worth pursuing