If I buy a share for delivery and set a stop loss that is triggered within 3 days from buying, will it be sold? Or it can sell only after 3 days? Any coonditions under which it can sell within 3 days?

General
2

The shares will be credited to your DEMAT by end of 3rd day…so its best if you can wait till the 3rd day EOD. More on this topic here - http://zerodha.com/varsity/chapter/clearing-and-settlement-process/