I am having a problem deciding when bore nefashot is necessary. First- how much do you have to eat for a bore nefashot? Second- i read somewhere that you can only say it if you finished the item within 7 minutes.. is that true? After eating an apple do i need to say bore nefashot?
Also- same thing with al hamechia- how much do i have to eat to say it? And is that the same rule- you have to finish within a certain amount of time to say this beracha acharona?