If you have placed a successful purchase order on the “T” day, then it would

take “T+1” working days for the shares to get delivered to your Demat account. 

Please note that this timeline does not include days when the market is closed i.e. bank holidays, Exchange holidays, Saturdays, and Sundays. 

This means that if your buy order gets executed on a Friday, your holdings will come into your Demat account by Tuesday's end of the day. 

Also, note that holdings will be delivered to your Demat account by Tuesday evening provided you do not sell them on Monday or Tuesday before they get delivered to you.