It really depends on the individual person, their mannerism, and how much time they put into it. We received (through the mail) a bunch of commercially bred babies on Tuesday. Took a couple of hours to sort (a few culls), count, and get them settled. When we put them in the 750 QT, they went to the bottom and were a bit spooked... Tuesday night, they were a bit curious but not interested in coming over to say hi... They tend to copy each other, but as of last night, as soon as we get close, they are ALL at the edge waiting, and about half will swim into your hand. IF your mannerism is calm/patient, usually just a few days to a week.
We sold some of our duplicate fish this spring... and the couple who came out couldnt get over how friendly they all were. Ours really are not any more friendly then average, but there's they said did nothing but hide whenever "she" went near the pond... well, if you met her, you would understand why... very impatient, quick moving, etc, and per her husband, since they didnt "instantly" bond with her, she just throws food at them and leaves...
As soon as the fish get used to seeing you and know you are not a predator (and give a small amount of food each time you go over), they will quickly become curious and interested in you. They are VERY food motivated
(stress small amounts of food, a few times a day, IF your weather still allows it)