"How long will you carry a new blade before deciding if she’s a keeper?"
What time do you have?
My memory is not what it use to be, as I've owned some models more than 4 times, I think the one I've bought the most was the Spyderco Southard, but now, I'm better at remembering not to get that one
But most times it's a day or two before I know if it will stay around or not, one tell tale sign is if I make a sheath for it, then I think enough of it to expend some time and effort to make it mine, but, that is not a hard and fast rule.
Other times I'll know within an hours time and lately if that was the case, I'll return it to the dealer.
But like others have said, 'it all depends' one tip I have is 'Don't buy a LOT of knives all at the same time!' when they all arrive around the same time, you can easily end up with buyers remorse and favour one or two more than the rest, while all are probably pretty nice by themselves, but it's the fact that you have too many new knives at the same time, it becomes hard to focus.
I've recently had this happen and I knew it probably would be a problem....and boy I hate being right

G2