Sometimes people can accidentally miss that they won, and some people don't check their profiles for days or weeks, so don't worry, if you didn't received feedback, as you will get it automatically ;-)
Sometimes some problems with the website happen too. I recently went into the "Won" giveaways and noticed the giveaway that... never popped up for me, when I was checking if I won something. Like, it was in checked one, even though I never saw it... maybe I had some problems with the page or connection and I checked the giveaway, but it didn't shown for me, then I didn't noticed it or something like that?
Judging by the date, it was about 5 days or less (4-5 days? But could be over 5 already, not sure) from the date of the giveaway, but it already had the positive, automatically given feedback. So, I suppose these "few days" are "5 days" or something close to it?
Anyway, good to verify that you used all the keys of your "Won" giveaways and didn't missed any, as the keys are automatically in revealed state and there's a chance to miss an information that you won :-)